PLANT BREEDING NEWS
EDITION 182
10 September 2007
An Electronic Newsletter of Applied Plant Breeding
Sponsored by FAO and Cornell University
Clair H. Hershey, Editor
chh23@cornell.edu
Archived issues available at: FAO
Plant Breeding Newsletter
CONTENTS
1. NEWS, ANNOUNCEMENTS AND RESEARCH NOTES
1.01 Farmers and researchers: Annan
urges stronger links
1.02 New reports examine
corn-ethanol-food price connections
1.03 World Bank boosts Ugandan agricultural
research
1.04 World rice research centres
unite for Africa
1.05 Definition of basmati rice to be
expanded
1.06 Funding Plant
Breeding in Australia
1.07 China establishes national soybean
engineering research center
1.08 The genetic revolution continues
at CIMMYT
1.09 New maize and wheat varieties to
fight hunger in Kenya
1.10 Texas Agricultural Experiment Station breeders are fortifying
wheat with consumers in mind
1.11 Studying grass for energy needs
1.12 Translational
Seed Biology: From Model Systems to Crop Improvement
1.13 Plant Variety Protection
for Southern Africa: Progress and Pitfalls
1.14 Biotech crops safe and pro-poor say FAO economists
1.15 Zambia adamant: no GM
1.16 Wheat relatives harbour supply of
resistance genes
1.17 Today's white rice is mutation spread by early farmers
1.18 Pride and pragmatism
sustain a giant Mexican maize
1.19 Researchers looking for flood-tolerant
soybeans
1.20 Molecular markers used to breed for high quality rice varieties
1.21 Cornell University
researchers clone aluminum-tolerance gene in sorghum, promising boost to crop
yields in developing world
1.22 Scientists seek new ways to control
potato pests
1.23 Breeding citrus
rootstocks: promising hybrids in Brazil
1.24 Two key findings steer cucumber disease
research
1.25 Challenges remain in reintroducing American chestnut
1.26 Same gene protects
from one disease, opens door to another
1.27 Partial sequencing of the barley genome planned
1.28 Eco-tilling detects resistance
1.29 Scientists harvest answers from genome of grain fungus
1.30 Future crops may hinge on gene rescue
1.31 Grain-based foods
could soon have highly targeted nutritional roles through advances in gene technology
1.32 High-lysine corn generated by
endosperm-specific suppression of lysine catabolism using RNAi
1.33 DuPont scientists identify and
silence plant gene that controls phytic acid
1.34 Circadian clock
controls plant growth hormone
1.35 OSU wheat breeder’s
genetic code-breaking means dollars to Oklahoma and region
2. PUBLICATIONS
2.01 Special issue of Euphytica "Challenges to International Wheat Breeding" available in journal
web site
3. WEB RESOURCES
3.01 From gene to green
3.02 GCP–IGD Interactive Resource Centre
and Helpdesk
4 GRANTS AVAILABLE
4.01 Bioversity International
Vavilov–Frankel Fellowships 2008
4.02 Call for proposals: GCP Genotyping
Support Service
4.03 Global Crop Diversity Trust announces
the opening of three new windows of funding
5 POSITION ANNOUNCEMENTS
(None posted)
6 MEETINGS, COURSES AND WORKSHOPS
7 EDITOR'S NOTES
=========================
1. NEWS, ANNOUNCEMENTS AND RESEARCH NOTES
1.01 Farmers and researchers: Annan
urges stronger links
Kimani Chege
[NAIROBI] Former United Nations Secretary General Kofi Annan yesterday (16 July)
urged African farmers to build stronger links with scientists and research institutions
as part of their efforts to boost food production on the continent.
He also said that, whatever the potential future benefits of genetically modified
(GM) crops, conventional seed breeding currently represented an important path
towards securing a 'green revolution' in Africa, and thus of decreasing Africa's
dependence on food aid.
Annan made his comments after a meeting with the Kenyan president Mwai Kibaki
in Nairobi, Kenya, as the new chairman of the Alliance for a Green Revolution
in Africa (AGRA), an organisation focusing on alleviating poverty and hunger in
Africa.
"As we speak, many people in Africa are receiving food donations. This is however
not sustainable," he said. "We need to get the right seeds into [the farmers]
hands by strengthening research partnerships with local universities and other
institutions."
Having recently toured Kenya, meeting some of Kenya's farmers and scientists,
Annan announced that the alliance will be based in Nairobi, Kenya. President Kibaki
ensured his country's support for the alliance and for the research community.
Annan announced that over the next four years the AGRA initiative will focus on
developing hardier seeds, improving soil health and use of fertilizers, improving
water management, and strengthening agricultural markets. The alliance will put
special emphasis on problems specific to small-scale farmers.
He also said AGRA programmes will not involve GM seeds, but will instead focus
on conventional seed breeding.
"Science is evolving. We do not know what science will offer us in ten or twenty
years. However, our programmes will not involve GM seeds," he said.
Annan said science and technology are becoming increasingly important to small-scale
farmers.
"The cell phone revolution has come to rural Africa, and farmers can now use their
cell phones to get real-time market information," Annan said, referring to the
Kenya Agricultural Commodity Exchange program.
"These are just a few of the many innovations bringing the benefits of technology
and science to small-scale farmers so that they can improve their farm productivity
and incomes and end the poverty that has become so entrenched in rural Africa,"
said Annan.
Annan said for Africa to achieve a green revolution as experienced in Asia in
the 1960s, governments must provide policies that can support growth, but must
be careful of obstructing progress.
Insufficient infrastructure, such as roads, poor storage facilities and weak market
structures must also be addressed, he said.
Related links:
Alliance for a Green Revolution in Africa
Source: SciDev.net
17 July 2007
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1.02 New reports examine corn-ethanol-food price connections
St. Louis, Missouri
A trio of new studies is shattering the myths about the relationship between the
price of corn, ethanol production and food prices. The National
Corn Growers Association (NCGA) sees the studies as proof that agriculture
can continue to meet the nation’s growing demand for both food and fuel.
Taken together, the reports, from the Center for Agricultural and Rural Development
(CARD) at Iowa State University, the Consumer Federation of America (CFA) and
Houston Biofuels Consultants LLC, show that higher corn prices have little effect
on either food or fuel prices.
NCGA did not participate in or provide funding for any of the studies.
“The CARD report repeats the conclusions it had reached in its study earlier this
year,” said NCGA Vice President of Public Policy Jon Doggett. “However, some people
misinterpreted that study’s findings, because it included a ‘worst-case scenario.’
This report is very clear – a 30 percent increase in corn prices would increase
consumer food prices by only about 1.1 percent.”
The CFA study includes a stinging criticism of the oil industry for failing to
use ethanol as a way to increase supplies of refined gasoline. The study notes
increased use of ethanol could actually help reduce food price increases. “High
energy prices cause higher food prices,” says CFA director of research Marc Cooper.
“(T)he historic corn-crude price relationship will cushion the impact that ethanol
production has on food prices.”
The report also said, “Based on the historical relationship between crude [oil]
prices and corn prices, current prices for corn are lower than one would predict,”.
Houston Biofuels Consultants comes to much the same conclusion. “Historically,
ethanol prices haven’t tracked corn prices,” it notes in the July issue of Ethanol
Producer Magazine.
- Click here
to read the CARD report.
- Click here to read the Consumers
Federation of America Report.
- Click here
to read the Houston Biofuels study in Ethanol Producer Magazine.
Source: SeedQuest.com
August 8, 2007
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1.03 World Bank boosts Ugandan agricultural
research
Agricultural research in Uganda has received a US$12 million boost from the
World Bank.
The bank's board of directors approved the loan for Uganda's Second Agricultural
Research and Training Project (ARTP II) this month (2 August).
The International Development Association, the arm of the World Bank that helps
the world's poorest countries by providing long-term, interest-free loans, is
financing the scheme.
ARTP II is part of the World Bank's long-term assistance programme to agricultural
research in Uganda. Its objectives are to generate new knowledge, strategies and
technologies in support of the Ugandan government's Plan for the Modernisation
of Agriculture.
The IDA financing, according to Madhur Gautam, ARTP II's task team leader, will
help fund a stream of innovations to improve agricultural productivity and better
utilise crop, livestock, fisheries and forestry resources for enhanced food security,
improved livelihoods and increased income for Uganda's smallholder farmers.
"The specific focus is on building the capacity of the National Agricultural Research
Organization (NARO) to conduct high quality research," Taqi Sharif, from the World
Bank's Agriculture and Rural Development Department, told SciDev.Net. The funding
will be used for updating the NARO research facilities and for training staff
to conduct quality and high impact research with direct impacts at the farm level,
he said.
The project was initially financed with a US$26 million loan in 1999 and was scheduled
to finish by 30 June 2007. But the new funding will now finance an additional
two-year period.
"Raising agricultural productivity is a key area for the [Ugandan] government's
Poverty Eradication Action Plan and a flagship operational area for the bank's
Africa Action Plan," said John McIntire, the World Bank's country director for
Tanzania and Uganda, in a press release.
"The importance of agricultural productivity for broad-based economic growth cannot
be overemphasised."
Ochieng' Ogodo
Source: SciDev.net
15 August 2007
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1.04 World rice research centres unite
for Africa
[LILONGWE] Sub-Saharan Africa could boost its rice production with the announcement
of increased collaboration between three of the world's leading international
rice research institutes.
The centres the Africa Rice Center (WARDA) based in Benin, the International
Centre for Tropical Agriculture (CIAT) based in Colombia and the Philippines-based
International Rice Research Institute (IRRI) announced their commitment
to bring the best of science and experience in Africa, Latin America and Asia
to address the major challenges faced by Africa's rice growers.
Africa currently imports about 40 per cent of its rice to satisfy local demand.
With rice prices expected to double in the next couple years due to shrinking
rice reserves, increasing African rice production is essential.
"By harmonising our activities we can cover the whole continent, have critical
mass [of rice scientists], address most of the problems facing rice [in Africa],
and at the end of the day we can have a very high impact," said Papa Abdoulaye
Seck, WARDA's director general, in a press release.
"Some of the agro-ecologies in Asia, Latin America and Africa are similar and
rice farmers in developing countries face similar challenges. Therefore, a successful
programmatic alignment where the comparative advantages of these centres are combined
can have a large-scale impact in Africa," Shellemiah Keya, director general for
research at WARDA, told SciDev.Net.
The centres have proposed creating an umbrella consortium the sub-Saharan
Africa Rice Consortium (SARC) to bring together already existing research
networks in Africa and include countries not covered by these networks.
SARC will address high priority issues for rice research and development in Africa,
such as improving rice varieties and farmers' access to them, increasing the number
of rice scientists in the region and improving collaboration.
The director generals of WARDA, CIAT and IRRI issued a joint statement saying
that the initiative creates a united front for rice research and a way of channelling
technology and information from international research to countries and farmers
in the region.
Charles Mkoka
Source: SciDev.Net
9 August 2007
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1.05 Definition of basmati rice to be expanded
New Delhi, India
Lok Sabha
The Indian Government proposes to expand the definition of basmati.
In the proposed definition of the evolved basmati, the bar of having one of the
two parents from among the traditional basmati varieties has been removed. Instead,
it expands the definition by including in the family history (genealogy), a Basmati
variety (Traditional or evolved) notified under Seed Act 1966, to pass the “basmati
quality seeds” into the new evolved varieties.
Thus, it seeks to declare all varieties of Basmati Rice notified as Basmati Rice
under the Seeds Act, 1966 (54 of 1966) and any future variety notified as Basmati
under the same Act are construed as Basmati Rice.
The proposed revised definition will facilitate the development of new Basmati
varieties and will promote the trade. This proposal has been sent to the Ministry
of commerce for consideration.
This information was given by Shri Kanti Lal Bhuria, Minister of State for Agriculture
in written reply to a question in the Lok Sabha today.
MP:CP:Loksabha(A)5.9.2007
Source: SeedQuest.com
5 September 2007
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1.06 Funding Plant Breeding in Australia
(SeedQuest Forum)
A Review of End Point Royalties and Future Funding Requirements
Presentation made by Donald J. Coles, Managing Director, Valley
Seeds Pty Ltd., Australia at the Summer Meeting of the Canadian Seed Trade
Association in Ottawa, Canada – July 2007
Abstract
The process of funding plant breeding in Australia has undergone great change
over the past 25 years. The impact of a change in public policy where state
governments have directed funds towards environmental, social and post farm gate
issues and away from applied plant breeding has been significant. This paper
explores the development of alternative funding arrangements for plant breeding
of major crop species and looks at factors affecting various stakeholders in the
value chain as a result of these changes.
End Point Royalties have been introduced as a potential alternative source of
funding for plant breeding. All participants in the supply chain are evaluating
its effectiveness and proposing changes to improve efficiency and effectiveness.
These issues are also raised along with the problems that they aim to overcome.
Introduction
Advances in plant breeding technology and associated intellectual property
frameworks have made plant breeding a new and potentially lucrative activity.
A gradual withdrawal of government and institutional support for this activity
has created an unstable environment in an industry that needs long term funding
stability. The concepts of “market failure” (Grey 2003) and “public good”
(Lindner 2004) investment have been used as reasons to slow the pace of change.
Some breeding organisations have embraced change and developed and promoted alternative
forms of funding rather than wait for change to be forced upon them. It
is these dynamic organisations that have proven to be successful to date.
The grower levy manager and federal government agency Grains Research and Development Corporation
(GRDC) has been willing to stand in and take control of the agenda in many of
the critical areas of applied breeding and breeding infrastructure. Coincidently
an expansion of grain production has increased levy receipts and supported the
interventionist plant breeding policies of GRDC.
Private breeders as represented by the Australian
Seed Federation – Plant Breeders & Proprietary Marketers Group, have introduced
and promoted the concept of End Point Royalties (EPR’s) as a potential method
of supporting a shift towards private breeding. The practice and implementation
of EPR’s, however has not been without its problems. Despite this, a chorus
of support emanates from all segments of the supply chain and this is leading
to shared and supported changes to make the system more efficient and affective.
See full article at http://www.seedquest.com/forum/c/ColesDonald/07jul.htm
Source: SeedQuest.com
July 2007
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1.07 China establishes national soybean engineering
research center
China on Wednesday officially established a national soybean engineering research
center in the northeastern province of Jilin in a move to promote its soybean
technology.
The center, located in the Jilin Academy of Agricultural Sciences (JAAS) based
in Changchun, capital of Jilin, began construction in March 2005 with an investment
of 20 million yuan (US$2.66 million).
Yue Derong, president of JAAS, said the center will focus on hybrid soybean research
and development.
The center has currently a staff of 82 people, including 51 researchers. It aims
to breed more than 20 species of hybrid and high-productive soybean by 2009.
Experts say the center will contribute to raising the production of soybean in
China and enhancing its competitiveness in world market.
Source: Xinhua via SeedQuest.com
23 August 2007
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1.08 The genetic revolution continues at CIMMYT
Gift from DuPont helps CIMMYT scientists look for genes in wheat and maize,
and gives breeders an affordable tool to help select the best
El Batán, Mexico
A quiet revolution is taking place in CIMMYT’s
biotechnology labs. The team has just received a new generation of genotyping
machines. These semi-automated work-horses will make it much easier to determine
whether breeding lines contain specific useful genes. It is hoped that this will
help maize and wheat breedersthrough a process known as marker-assisted selection
(MAS)to make breeding more effective and get crop varieties with valuable
traits to poor farmers more quickly.
Traditionally, the only way to find out whether the offspring from a particular
cross have inherited useful characteristics, such as drought tolerance, disease
resistance, or grain quality, has been to grow them in the field and evaluate
the adult plants. MAS can speed up the breeding process, since it makes it possible
to track the presence of desired genes in every generation. This does not bypass
the need for field evaluation, but can greatly improve the efficiency of the process.
“Field screening takes time, space, and resources, and our capacity is limited,”
explains CIMMYT maize breeder Gary Atlin, “but with MAS we could use resources
more effectively, zeroing in on the best lines to test in the field and filtering
out those that haven’t inherited the characteristics we need.”
When researchers want to find out whether a particular line of wheat or maize
has the useful version of a gene (for example, disease resistance rather than
disease susceptibility), they use nearby, identifiable sections of DNA known as
markers, labeled with a fluorescent dye. Different versions of markers and genes
are called alleles. DNA that is close together on the chromosome tends to stay
together over generations, so a specific allele of a marker will be routinely
inherited alongside the desired allele of a nearby gene. Using the new capillary
electrophoresis genotyping machines, the sample is forced along a narrow capillary
tube under the influence of an electric current. A laser at the end of the tube
detects the different alleles of the fluorescent markers, indicating to the scientist
whether the sample contains the allele they want.
The two ABI 3700 machines have been generously donated to CIMMYT by DuPont
through its Pioneer Hi-Bred seed business, reflecting a
fruitful collaborative relationship of more than a decade’s standing. Until now,
CIMMYT has run most of its marker-assisted selection work on manual, gel-based
electrophoresis apparatuses. In addition, analyses of genetic relationships between
different wheat or maize lines have been run on older ABI genotyping machines,
including two based on the previous, much slower generation of gel-based machines.
The new machines can handle many more samples96 each at a timebut it’s
the savings in hands-on time that makes the real difference. “There’s no comparison,”
says Marilyn Warburton, Head of CIMMYT’s
Applied Biotechnology Center. “It will take us ten minutes to load one of these
new machines, whereas it takes about four hours to make and load a manual electrophoresis
gel.”
As well as being much quicker and less labor-intensive, capillary electrophoresis
makes it possible to test for more than one marker and run more than one sample
at once in each tube. By using different colors of fluorescent dye for each sample,
markers for each can be distinguished, like teams of runners wearing different-colored
jerseys. For maximum efficiency, scientists can also set up groups of samples
to run at slightly different times, like runners set off in a staggered start.
CIMMYT will even be able to develop a new type of marker, known as SNPs, which
allow numerous traits to be tested simultaneously, providing more information
per sample.
All of this means that the new machines have a much higher throughput capacity,
and can process many more samples for the same labor input, drastically reducing
the per-sample costcurrently the major constraint on use of MAS. “If MAS
were significantly cheaper, I would certainly use it in maize breeding,” says
Atlin. “Effectively, it lets you quickly transfer the genes you want into improved
varieties. If you’re doing a backcross between a donor with a desired trait and
an improved parent with good agronomic performance, you’re trying to select for
one characteristic from the donor, but against all its other genes. With a number
of markers, MAS makes it possible to determine exactly which progeny combine the
desired gene from the donor with the good genes from the other parent. You can
get results in two generations, compared to four or five normally.”
The challenge for MAS is finding genes with substantial effects, especially for
complex traits such as drought tolerance in maize. Atlin believes such genes are
still to be found. “In the past, donors with a single useful gene or trait but
otherwise poor agronomic qualities were very difficult to use in breeding, as
they introduced so much bad material. We can get rid of that useless material
through MAS. That opens up the field to look for useful genes in a wider range
of parents. And genotyping technology is getting cheaper and better at finding
genes all the time.”
In wheat, the hunt for useful markers at CIMMYT is more advanced. “We’re working
with new markers to select for nematode resistance, leaf and stem rust resistance,
boron tolerance, Fusarium resistance, and grain quality,” says Susanne Dreisigacker,
CIMMYT wheat molecular biologist. “Our current work is all gel-based, which means
running tests sample by sample and marker by marker. Being able to run many samples
at the same time will make a huge difference.”
Source: CIMMYT
E-News, vol 4 no. 8, August 2007 via SeedQuest.com
3 September 2007
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1.09 New maize and wheat varieties to fight hunger in Kenya
Nairobi, Kenya
Kenya’s Ministry of Agriculture recently launched high-yielding and drought and
disease resistant varieties of maize, sugarcane and wheat to enhance the country’s
food security. The seeds, developed by the Kenya
Agricultural Research Institute (KARI) are being marketed by 53 seed companies
in Kenya, as well as in Uganda, Tanzania, Congo and Sudan.
Poor rains in parts of pastoral and agricultural marginal areas could precipitate
food shortage this year and Agriculture Minister, Kipruto Kirwa, urged the farmers
to use the new seed varieties if the country is to improve its strategic food
reserve. However, because of the exorbitant prices of the new varieties, many
small scale farmers in Kenya still rely on their own traditional seeds. Kirwa
encouraged the seed distributors to lower their prices and expand their limited
investment retail networks. Sufficient food supply for Kenya can only be attained
through a joint effort of the government and private companies.
Source: CropBiotech Update viaSeedQuest.com
31 August 2007
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1.10 Texas Agricultural Experiment Station breeders
are fortifying wheat with consumers in mind
Amarillo, Texas
Wheat breeders are working to put a a "little muscle" into bread, in addition
to helping producers get better yields, said a Texas
Agricultural Experiment Station researcher.
Bread producers need stronger gluten flours, said Dr. Jackie Rudd, Experiment
Station state wheat breeder in Amarillo. Gluten is the protein in wheat that allows
bread to expand and hold the shape.
At a meeting of the Wheat Quality Council, Hayden Wands, director of procurement
for Sara Lee Corp. said flours with a stronger gluten are needed for breads to
ensure they will not squash during stacking on the grocery shelves, Rudd said.
Wands also talked about the many new bread products the company offers with ingredients
such as blueberries, which further accentuate the need for stronger flours, Rudd
said.
In recent tests across the state, Experiment Station wheats have ranked among
the top performers when tested for protein content (gluten), seed size and test
weight (milling attributes), dough strength (baking), and disease resistance and
yields, he said.
In addition, Texas Cooperative Extension wheat variety trials across the state
have as many as five Texas A&M University system wheats ranked in the top
10. For complete results of the variety trials, go to http://amarillo.tamu.edu/programs/agronomy/
.
Rodney Mosier, Texas Wheat Producers Board executive vice president, said the
board's priorities for their research dollars used to be focused mainly on developing
wheats that were higher yielding, drought-tolerant
varieties. These wheats had average baking qualities and disease resistance.
In recent years, the board's priorities have changed, Mosier said. Funding now
includes a priority for higher milling and baking qualities with improved disease
and insect resistance.
"The board has been very pleased with the funding it has provided for ongoing
research with Texas A&M, which has provided excellent results," he said. "Just
this past year, the Wheat Quality Council recognized Texas A&M
for producing wheats with excellence in milling and baking qualities."
These wheat lines are now being marketed to producers, Rudd said. Newly released
are TAM 304, a good disease resistant irrigated variety has been licensed to Scott
Seed Co. of Hereford; and TAM 203, showing
disease resistance and excellence statewide, has been licensed to AgriPro Wheat in Vernon, he said.
The Experiment Station has had two other recent releases that are topping experiment
trial data, Rudd said. TAM 111, the leading grown variety in the High Plains for
both dryland and irrigated wheat, is licensed to AgriPro; and TAM 112, with excellent
dryland yields and greenbug resistance, is licensed to Watley Seed Co. of Spearman.
Experiment Station wheat varieties have long been known for excellence in dryland
yields, he said. However, in the past five or six years, a concentrated effort
of increased testing and quality monitoring by Dr. Lloyd Rooney at the Wheat Quality
Lab in College Station has improved the baking and milling quality.
"Our reputation for good dryland yields has been maintained, but now we are recognized
for excellent bread-baking quality," Rudd said.
That doesn't mean the producer's needs for high yields, disease resistance and
pest resistance are taking a back seat, though, he said.
Rudd said the newest Texas varieties were discussed at this year's field day for
Great Plains wheat breeders in Fort Collins as being the best in leaf rust and
stripe rust resistance.
That is due in part, he said, to the dedicated work of Dr. Ravindra Devkota, a
research scientist from Bushland, who has spent significant time making wheat
selections in South Texas where these rusts start.
"That's why our material is not just good across the High Plains, but also the
rest of the state," Rudd said. "Texas A&M varieties are grown on more than
50 percent of the High Plains, but much less in the rest of the
state."
With the increased disease resistance, though, that figure will go up, he said,
because the new experimental lines in the breeding plots are looking even better
than what is now in the field.
"We have more good material than we can put into the marketplace," Rudd said.
"It's an excellent problem to have. It's been nice to be able to discard some
lines that are better than wheat we currently have, because we know what we have
in the pipeline is even better.
"We hope this will lead to increased exports for Texas wheat," he said. "The idea
is that importers of U.S. wheat will select Texas wheat based on quality rather
than cheap price. The U.S. has consistently been the least-cost provider of wheat,
but we want Texas wheats to be sought out for their milling and baking quality."
by Kay Ledbetter
Source: SeedQuest.com
29 August 2007
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1.11 Studying grass for energy needs
Ithaca, New York
By Lauren Chambliss
Watching grass grow is not normally the most exciting activity -- unless the future
of New York's energy needs, rural economic development and reducing the human
contribution to global climate change depend on it.
From the lab to the field, Cornell University researchers are analyzing
every aspect of some field grasses in a multidisciplinary, high-octane search
for the next generation of biofuels from such cellulose feedstocks as grasses
and willow trees, which can be converted to ethanol and other products.
Nationally, corn is the leading source of biofuel, but in the long run, researchers
say, New York will be better off developing alternative renewable sources of cellulosic
ethanol that will be healthier for the environment, address energy needs and potentially
create new business for rural farmers and landowners.
In the past few years, Cornell researchers have planted trial plots of field grasses
-- cellulosic ethanol feedstocks -- in six sites across the state. Along with
dozens of other renewable-energy research projects at the College of Agriculture
and Life Sciences and the College of Engineering, the grass trials hold an important
key to the future of New York's energy strategy for the 21st century.
New York Gov. Eliot Spitzer's new energy initiative calls for the state to obtain
25 percent of its energy needs from renewable resources, including biofuels, by
2013. Rising concern about global climate change is also pushing the biofuels
train as a renewable "clean" energy source that could reduce reliance on fossil
fuels.
If all goes well, the grass trials, funded by the federal government through the
Cornell University Agricultural Experiment Station, with additional support from
the New York Farm Viability Institute and the Northern New York Agricultural Development
Program, will provide development tools to create a viable industry. The ultimate
goal of Cornell biofuels research is to discover the best sustainable bioenergy
crops for diverse bioregions and provide businesses and entrepreneurs with new
technologies and systems to convert grasses, wood and other biomass to usable,
renewable energy with minimal environmental impact.
"Because New York contains and is near other major population centers and has
a large amount of agricultural land that could be used for producing feedstocks,
it is uniquely situated to be a major player in the biofuels industry," says Donald
Viands, Cornell professor of plant breeding and genetics and a lead principal
investigator on the project. Cornell, with scientists from multiple disciplines,
is partnering with others to provide cutting-edge research and extension activities
necessary "to realize the potential of biofuels in a safe and sustainable manner,"
says Viands.
Interest in biofuels is so high that at a recent demonstration of grass trials
at an experiment site in Big Flats in Chemung County, more than 100 people, including
farmers, policy-makers and researchers, showed up on a 100-degree day for a tour
of fields of big bluestem, switchgrass, coastal panic grass and other species
grown in partnership with Cornell researchers.
Adding urgency to the so-called "green energy revolution" is the fact that 90
percent of New York energy needs are currently met by imported oil and natural
gas, which is higher than the national average, says Joseph Laquatra, professor
of design and environmental analysis. To reduce its vulnerability to high oil
prices and potential supply disruptions, the state needs to develop more indigenous
sources of energy.
In the long term, cellulosic ethanol and other forms of bioenergy from grasses,
legumes and wood products are expected to play a significant role in energy supplies,
especially in New York, where some portion of 1.5 million acres of idle and underused
agricultural lands could be turned into fuel-generating crops.
Source: Cornell University ChronicleOnline via
SeedQuest.com
5 September 2007
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1.12 Translational Seed Biology: From
Model Systems to Crop Improvement
Leading plant scientists from around the world will gather Sept. 17-20
at the University of California, Davis, to explore how research discoveries in
seed biology can be parlayed into practical solutions for global agriculture
Davis, California
Seeds and global agriculture are focus on international symposium
The four-day symposium, "Translational Seed Biology: From Model Systems to
Crop Improvement," is hosted by the UC Davis Plant Sciences Department. It
will be held on campus in Freeborn Hall, with a tour of Sacramento Valley seed-production
operations planned for Sept. 20.
"This international symposium will focus on how fundamental knowledge of seed
biology can be transferred into practical use to improve the agricultural and
nutritional value of crops," said Kent Bradford, conference coordinator and director
of UC Davis' Seed Biotechnology Center.
"The ability to modify seeds with specific changes provides enormous potential
to meet the growing global demand for food and improved nutrition, but only if
research discoveries can be adapted to the biological requirements of seeds and
to the practical economic demands of the marketplace," Bradford said.
The symposium will bring together scientists who study fundamental aspects of
seed biology as well as crop scientists and breeders who use that knowledge to
develop new crop varieties. The meeting coordinators anticipate that this broad
range of symposium participants will identify high-priority challenges and opportunities
for future crop research and development.
Keynote speaker for the conference's opening evening session on Sept.
17 will be Rob Horsch, director of agricultural programs for the Bill and Melinda
Gates Foundation. Horsch will discuss the critical role of seed improvement in
global agriculture.
Other conference speakers will include:
-Robert Goldberg, a professor and plant scientist at UCLA. Goldberg is
an elected member of the National Academy of Sciences and a Howard Hughes Medical
Institute researcher. He developed a hybridization system that works universally
in major crop plants. (Tuesday morning)
-Jorge Dubcovsky, a UC Davis wheat geneticist and breeder. He recently
identified a gene that can increase the protein and micronutrient content of wheat
grains, and is studying the evolution of wheat during its domestication. (Tuesday
afternoon)
-Christina Walters of the U.S. Department of Agriculture's National Center
for Genetic Resources Preservation in Ft. Collins, Colo. She studies the mechanisms
by which seeds age and die during storage. The center, known as the "Fort Knox
of seeds," is the primary repository in the United States for plant seeds and
other plant hereditary material. (Wednesday morning)
--Maarten Koornneef, director of the Max Planck Institute for Plant Breeding
Research in Cologne, Germany. He is internationally recognized for developing
the small, rapidly growing Arabidopsis thaliana plant as a model genetic system
for plant research. Koornneef, a foreign member of the National Academy of Sciences,
has identified a number of specific genes that regulate seed germination and dormancy.
(Wednesday afternoon)
-Yuji Kamiya, director of the growth regulation research group at the RIKEN
Plant Science Center, a major Japanese research center in Yokohama, Japan. He
is an international leader in identifying the natural plant hormones that regulate
the development and germination of seeds. (Wednesday afternoon)
-Jorge Mayer, a biochemist and manager of the Golden Rice Humanitarian
Foundation in Freiburg, Germany, which seeks to commercialize rice that is biofortified
with beta-carotene, the precursor to vitamin A. (Wednesday evening banquet)
-T.J. Higgins, Deputy Chief of the Commonwealth Scientific and Industrial
Research Organisation (CSIRO) in Canberra, Australia. He has developed cowpea
seeds that are resistant to insects that consume them during storage and seeds
that have increased nutritional content. (Thursday morning)
-Roger Beachy, a distinguished plant scientist who led the research team
that developed the world's first genetically modified food crop, a tomato variety
modified for resistance to viral disease. Beachy, an elected member of the National
Academy of Sciences, is the founding president of the not-for-profit Donald Danforth
Plant Science Center in St. Louis, Mo. (Thursday morning)
A complete conference program and list of speakers is available online at http://www.plantsciences.ucdavis.edu/seedsymposium2007/
Source: SeedQuest.com
4September 2007
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1.13 Plant Variety Protection for Southern Africa: Progress and Pitfalls
Editorial views by Dr. Wynand J. van der Walt, PhD, Senior Partner: Agricultural
Biotechnologies, FoodNCropBio facilitation and consulting services, Pretoria,
South Africa, retired General Manager of SANSOR, former Board member of the African
Seed Trade Association (AFSTA) and AfricaBio
Neither plant variety protection (PVP) systems nor modern biotechnology offer
miracle solutions to food insecurity and malnutrition in Africa; yet, they offer
meaningful tools for enhancing food production and alleviating poverty. Most of
Africa, excluding South Africa, missed out on the green revolution of the sixties
and remain sluggish in adopting biotech crops, thereby running the risk of losing
out on the gene revolution. On the positive side, considerable efforts over the
past decade have now approached the point of implementation of wider adoption
of breeders’ rights and biotech crops.
UPOV membership presently stands at 63 plus the
European Union (EU) with 27 and the African
Intellectual Property Organization (OAPI) with 16, making a total of 106.
Apart from the OAPI group as one member, Africa has only four members out of some
54 countries: South Africa, the 10th member in 1978, and Kenya, Tunisia and Morocco
that joined very recently, compared to Latin America with nine members. The recent
UPOV Model serves to accommodate new applicants in several ways. PVP has proven
benefits: stimulating plant breeding, private seed enterprise development, access
to new varieties, and reducing piracy, as confirmed again in the 2005 UPOV impact
study in five target developing countries. The delay in African adoption of PVP,
therefore, remains a cause for concern.
Plant variety protection can only operate adequately in an enabling environment
that facilitates seed trade, variety registration and adherence to quality standards.
It is a positive sign that the many cycles of interaction between stakeholders
and regulators have now resulted in a Memorandum of Understanding (MOU) in the
14-country Southern African Development Community
(SADC). An MOU means different things to different people, but, in this case,
it provides a framework for a harmonized approach in variety testing, tests for
agricultural value, a regional variety catalogue, seed certification, and a reduced
quarantine pest list. GM biotech varieties are presently not eligible until SADC
reaches a common position on crop biotechnology. The MOU will now move to Permanent
Secretaries for signing, submission to national Parliaments for approval, development
of action plans, implementation, and consolidation. It will enter into force when
two-thirds of SADC member states have approved the MOU (one can assume that it
should take the form of a harmonized set of seed legislation before approval).
A plant breeders’ rights protocol for the SADC region has now reached a semi-final
stage. It has been drafted in accordance with the new model developed by UPOV
and incorporates UPOV 1991 provisions of 25 years’ protection for trees and vines,
and 20 years for others, essential derivation, etc. It also accommodates eligibility
for protection of existing varieties not conforming to novelty, subject to application
within one year of entering into force of the PBR Protocol. Such known varieties
must have been registered on an official variety list or enjoy current breeders’
protection under an acceptable system or in the process of application. The period
of protection will be 20 years minus the time that the variety has been officially
listed or awarded breeders’ protection. The privilege of using harvested material
as plant propagating material is extended only to “subsistence” farmers and no
mention is made of exclusion of ornamentals, trees or vines. These uncertainties
need to be clarified as is omission of requirements for entry into force for the
region and for a member state.
Both the seed legislation MOU and the PBR protocol will be handled administratively
at the SADC Secretariat level but details have not yet been finalized These two
regional developments are to be welcomed but possible pitfalls should be kept
in mind:
-Continued bureaucratic delays in approving and implementing the MOU and PBR protocol
-Putting GM crops on the back-burner until biosafety and policy issues are cleared
up
-Farmers getting restless about lack of access to new conventional and biotech
varieties, obtaining such seeds without approval and proceeding to plant them
-Some member states adding additional requirements, as they are doing to draft
biosafety frameworks, thereby negating a harmonized approach
-Inadequate capacity at member states and SADC Secretariat level to administer
the systems and enforce them
-Considering the inability to regulate farmers’ privilege in most countries where
50 to 90 per cent of seed comes from informal systems and where farm-saved seed
is rampant
-Seed companies focusing on hybrids and holding back improved open-pollinated
varieties
Lack of accepting that comprehensive IPR systems – PBR, patents, trade marks,
geographic indicators-- are required to protect novel plants, failing which, African
plant breeding and innovation will remain exposed to piracy.
The hard work put in by stakeholders and regulators should be applauded but success
will require expedited approval and implementation. Time is not on the side of
Africa.
Dr Wynand van der Walt can be reached at wynandjvdw@telkomsa.net
Source: SeedQuest.com
Editorial, August 2007
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1.14 Biotech crops safe and pro-poor say FAO
economists
Two U.N. Food and Agriculture Organization economists, Terri Raney and Prabhu
Pingali write a sharp article in the September issue of Scientific American (sub
required) on how genetically enhanced crops can and do help poor farmers in developing
countries. I can't quote everything, but one particularly good point the FAO economists
make is that scientific evidence shows that currently available biotech crops
are not harming either people or the natural environment. To wit:
The chief food-safety concerns are are fears that allergens or toxins may be present
and that other unintentional changes in the food composition may occur. Yet to
date no verifiable toxic or nutritionally deleterious effects resulting from the
consumption of transgenic foods have been discovered anywhere in the world (emphasis
mine). National food safety authorities of several countries have evaluated the
transgenic crops currently being grown commercially and the foods derived from
them, using procedures based on internationally agreed upon principles, and have
judged them all safe to eat.
Environmental concerns center on the spread of transgenes to related crops or
weeds ("gene flow"), the development of herbicide-resistant weeds, the development
of insect pests resistant to the Bt toxin (which has long been used as a pesticide,
particularly by organic farmers), harm by insect-resistant crops to nontarget
organisms, and indirect environmental effects that come about because transgenic
crops lead to different cropping practices.
Scientists disagree about the likelihood and potential consequences of these hazards.
Gene flow, for example, is acknowledged to be possible when transgenic crops are
grown close to related plants, but the transgene will persist and spread only
if they give the recipient plant a competitive advantage. Such gene flow could
inflict economic harm by, for instance, making a product ineligible for a status
such as "organic." What would suffice to constitute ecological harm is more controversial.
Thus far, none of the major environmental hazards potentially associated with
transgenic crops has developed in commercial fields. Herbicide-resistant weeds
have been observed--although not necessarily caused by growing transgenic crops--and
so far they can be managed by alternative herbicides. The lack of negative impacts
so far does not mean they cannot occur, of course. Scientific understanding of
ecological and food-safety processes is incomplete, but many of the risks highlighted
for transgenics are similar to risks inherent in conventional agriculture as well.
Raney elsewhere argues that biotech crops can be pro-poor.
The economic evidence available to date does not support rhe widely held perception
that transgenic crops benefit only large farms; on the contrary, the technology
may be pro-poor. Nor does the available evidence support the fear that multinational
biotechnology firms are capturing all of the economic value created by transgenic
crops. On the contrary, the benefits are shared by consumers, technology suppliers
and adopting farmers, although non-adopting farmers are penalized as their competitors
achieve efficiency gains they are denied.
Her whole article on the pro-poor potential of biotech crops here.
With regard to gene flow, researchers have long recognized that the issue is not
confined to genetically enhanced crops; it occurs between conventional crops and
other plants as well. For more on gene flow see my column "Transgenics Gone Wild!"
For another report on the pro-poor nature of genetically enhanced crops take a
look at this 2006 one by the Union of German Academies of Sciences and Humanities.
http://www.truthabouttrade.org/article.asp?id=8080
Ronald Bailey
Source: AgBioView & Reason Online
23 August 2007
Contributed by Elcio Guimaraes
elcio.guimaraes@fao.org
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1.15 Zambia adamant: no GM
[LUSAKA] The Zambian government has rejected a call made this week (30 July)
by a group of scientific, agricultural and nongovernmental organisations to use
genetically modified (GM) crops to reduce poverty and hunger.
The group consisting of AfricaBio, the Africa Biotechnology Stakeholders
Forum, Africa Harvest Biotech Foundation International, Biotechnology-Ecology
Research and Outreach Consortium (BioEROC) and the International Service for the
Acquisition of Agri-biotech Application (ISAAA) released a joint press statement
endorsing the use of genetically modified organisms (GMOs), which was published
in the Times of Zambia on 30 July.
Responding to the statement, Zambian minister of agriculture and cooperatives,
Ben Kapita, told SciDev.Net, "We have always said that Zambia will not be used
as a dumping place for GMO products."
Earlier this year (3 April), the Zambian parliament adopted a biosafety bill aimed
at preventing the entry of GMOs in to the country (see Zambia
takes steps towards biosafety law).
But Wisdom Changadeya, executive director of BioEROC in Malawi said in a press
release that nobody could deny Africa its right to a technology that would help
its farmers solve some of its most serious and urgent problems.
Margaret Karembu, a researcher at the Kenya-based AfriCenter, run by the ISAAA,
warned that African agricultural productivity could drop while the rest of the
global community embraced new tools such as GM technology.
She said that African farmers should not be restricted to traditional methods
of agriculture.
The same group of five organisations also welcomed a clarification from the Alliance
for a Green Revolution in Africa (AGRA) about its stance on GM technology.
Last month, many media outlets reported that AGRA and its president the former
UN secretary-general, Kofi Annan, had rejected the use of GMOs completely.
The reports came after a speech by Annan in Nairobi last month (16 July), in which
he said that whatever the future potential of GM crops might be, conventional
breeding represented an important path to food security (see Farmers
and researchers: Annan urges stronger links).
AGRA has since clarified their position on GM technology, stating that although
they are not currently funding research into GMOs, they support the use of science
and technology including GM to aid African smallholder farmers.
Norah Olembo, chief executive officer of Africa Harvest Biotech Foundation International
in Nairobi, Kenya, welcomed AGRA's clarification that GM technology has an important
role to play in fighting poverty, hunger and malnutrition.
But others believe that not researching GM technology at this stage could undermine
the future of biotechnology in Africa.
This week (27 July) the Netherlands-based Public Research and Regulation Initiative
wrote to Annan, saying they were concerned about AGRA's focus on conventional
plant breeding methods.
Michael Malakata
Source: SciDev.Net
3 August 2007
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1.16 Wheat relatives harbour supply
of resistance genes
Scientists could transfer new genes into cultivated wheat crops
Researchers have shown that wild relatives of cultivated wheat exhibit resistance
to a number of fungal diseases, and could provide a source of resistance genes
to introduce into cultivated wheat.
They published their findings in August issue of the journal Plant Disease.
Lead researcher Brian Steffenson, plant pathologist at the US-based University
of Minnesota, and colleagues have shown that there is a high level of disease
resistance in samples of Sharon goatgrass (Aegilops sharonensis) collected
from southern Lebanon and the Israeli Coastal Plain.
For example, they found that around 70 per cent of the goatgrass samples were
resistant to a certain type of stem rust, a fungal disease that threatens much
of the world's wheat crops (see Deadly
wheat disease 'a threat to world food security').
Four out of 107 samples were highly resistant to most of the wheat fungal diseases
tested for powdery mildew, leaf rust, stem rust, stripe rust, tan spot and
spot blotch.
Co-author of the paper, Yehoshua Aniksterat, of the Israel-based Institute for
Cereal Crops Improvement at Tel Aviv University, told SciDev.Net that although
it could be difficult and take up to five years or more they may be
able to transfer genes from wild to cultivated wheat.
Steffenson told SciDev.Net that wild ancestors of cultivated plants often carry
resistance to disease organisms.
He said the research project will continue to evaluate wild wheat and barley species
for useful genes, not only for disease resistance but also those contributing
to higher yield, nutritional quality and adaptation to harsh environments.
Rodomiro Ortiz, director of resource mobilisation at Mexico-based International
Maize and Wheat Improvement Center, told SciDev.Net the research reveals the genetic
wealth available in wild relatives of important crops such as wheat and is useful
for creating new cultivated crops.
But more research will be needed to confirm that these wild samples have broad-spectrum
resistance and resistance to the most virulent forms of the pathogens, he said.
Link to abstract
of plant disease journal
Reference: Plant Disease 91, 942 (2007)
Wagdy Sawahel
Source: SciDev.net
13 August 2007
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1.17 Today's white rice is mutation spread by early farmers
By Krishna Ramanujan
Some 10,000 years ago white rice evolved from wild red rice and began spreading
around the globe. But how did this happen?
Researchers at Cornell and elsewhere have determined that 97.9 percent of all
white rice is derived from a mutation (a deletion of DNA) in a single gene originating
in the Japonica subspecies of rice. Their report, published online in the
journal PloS (Public Library of Science) Genetics, suggests that early farmers
favored, bred and spread white rice around the world.
The researchers report that this predominant mutation is also found in the Indica
subspecies of white rice. They have found a second independent mutation (a single
DNA substitution) in the same gene in several Aus varieties of rice in
Bangladesh, accounting for the remaining 2.1 percent of white rice varieties.
Neither of these two mutations is found in any wild red rice species.
Both mutations produce shortened versions of the same protein in which the missing
part is responsible for activating the molecular pathway leading to grain color
in rice.
"We think that other domains of this protein are critical for other functions
in the plant, because we never see the protein entirely deleted, just the part
of the molecule that affects the pathway for grain color," said Susan McCouch,
Cornell professor of plant breeding and genetics and the paper's senior author.
Megan Sweeney, Cornell Ph.D. '06 and postdoctoral associate, was the paper's lead
author.
The researchers speculate that ancient farmers actively bred and spread white
rice varieties first throughout the Himalayan region and then the rest of the
world because the varieties cooked faster (requiring less fuel), their hulls were
easier to remove compared with red rice, and disease and insects were easier to
see amid the white grains. The farmers also may have favored one mutation over
the other because it may have produced favorable grains more consistently, the
researchers say.
In 2006 the researchers first identified the gene that makes the rice seed's bran
layer, or pericarp, white. This gave rice breeders and engineers a genetic marker
to help develop new breeds. The Cornell researchers regularly introduce favorable
genes from wild red rices into elite white cultivars to improve yields and provide
better responses to stress, but they generally select against the gene for red
pericarp because it is associated with such unfavorable "weedy" linked traits
as seed dormancy and "shattering" (where seeds fall easily from the stalk).
"Breeders can now begin to screen for the red pericarp gene while selecting against
closely linked traits like shattering and dormancy," said McCouch. The new tools
may lead to more diverse domestic rice varieties.
Also, breeders are interested in using the marker to predict whether new generations
will contain white or red grains, using DNA from young seedlings, long before
the plants set seed.
McCouch noted that due to the genetics of pericarp color in rice (white grain
is recessive and maternally inherited), when white grains appear in the panicle
(the grain clusters on the stems), it is an indication that all seeds in the clusters
will be white -- and offspring from these seeds will continue to produce white-grain
plants. The researchers theorize that women who shucked rice for cooking thousands
of years ago would have recognized the value of the white seeds and may have set
aside selected panicles for breeding and planting.
Scott Williamson and Carlos Bustamante, both researchers in Cornell's Department
of Biological Statistics and Computational Biology, were also co-authors on this
paper. The research was supported by the Plant Genome Program of the National
Science Foundation, the Generation Challenge Program, Chengbuk National University
and Korea's National Institute of Agricultural Biotechnology.
Source: EurekAlert.com
16August 2007
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1.18 Pride and pragmatism sustain a giant
Mexican maize
El Batán, Mexico
Long as a man’s forearm, the biggest maize ears in the world are found in Jala,
in the state of Nayarit, on the Pacific coast of Mexico. The traditional variety
of this community is at risk, but a maize festival and the variety’s value in
local culture and dishes keep farmers growing it, while researchers work to restore
and improve its potential.
At the annual competition for the longest maize ear in the world, beauty queens
and dignitaries wait in obscurity at the back of the stage, while the spotlight
is on the bundles of ears lined up at the front. As darkness falls over the main
square of the Mexican village of Jala on the evening of August 14, 2007, the 30
participating farmers are called onto the stage one by one, carrying their precious
ears of maize. Each ear is systematically stripped of its husks and measured,
and the data are recorded under the watchful eye of its grower. Many reach more
than 30 cm (12 inches), and the first place goes to an ear 36 cm long.
At the height of the rainy season, lush, green fields and mountains surround Jala.
The valley is overlooked by the active volcano Ceboruco, which last erupted in
the 1870s and whose mineral-rich ash is believed by locals to make the giant Jala
maize grow so wellindeed, it does not reach its full size when grown outside
the valley. The variety is intimately adapted to its environment and an integral
part of the identity and traditions of the people who grow it. Despite this, like
many traditional varieties throughout Mexico, the Jala maize and the genetic diversity
it carries are under threat of extinction, as improved varieties take over and
young people leave the land looking for a better life. The competition for the
biggest ear was established in 1981 in an attempt to ensure the preservation of
Jala maize by encouraging farmers to grow it. It is held every year as part of
the village’s two-week Feria del Elote, or green maize ear festival.
The Jala maize is a landracea traditional variety specific to a particular
place that has been grown by farmers over generations. A number of other, regular-sized,
landraces originating from other parts of Mexico are also grown in Jala. Collectively
they are known as maíz de húmedo, as they have long growing seasons of around
seven to eight months and are planted in April to take advantage of residual soil
moisture before the summer rains begin.
Key ingredient in rich traditions and dishes
Jala maize grains contain a lot of flour. They are therefore prized for making
boiled or roasted green ears, the Mexican flat-bread tortilla, pozole (a kind
of pork and maize stew), gorditas (a sweet breadcake), and many other traditional
dishes. But their flouriness also means the kernels are less dense and thus fetch
a lower price on external markets, where maize is sold by weight.
Improved varieties of maize are inexorably supplanting the Jala landrace. They
are shorter, which makes them easier to manage and less prone to falling over
(lodging) in high winds, and yield much more (around 7-8 tons of grain per hectare,
compared to around 3 tons per hectare for maíz de húmedo). Even more importantly,
the improved varieties grown in Jala give relatively high yields of husks, which
are exported to the USA and the rest of Mexico for wrapping tamales, a popular
Mexican dish. The valley’s climate is changing, and the reduced rainfall also
favors improved varieties, which reach maturity in around four to five months
and thus can be sown in drier soils, after the rains begin. As a result less than
5% of the Jala’s maize-growing area is currently sown to the landrace. Furthermore,
maize itself is being replaced by cash crops, predominantly blue agave for tequila
and tobacco.
Recovering lost length
Because it has outcrossed with improved varieties, Jala maize’s prodigious
height, ear length, ear thickness, and growing season have all diminished over
the last century. In 1907 a visiting scientist recorded ears 60 cm long, whereas
the longest in recent times have measured a mere 45 cm. Working to reverse these
trends is J. Aharón Hernández Guzmán, research professor at the Colegio de Postgraduados,
a Mexican agricultural institution. Hernández is growing landrace seed from 22
farmers in a plot in the valley to recombine the genetic variation. The seed will
be redistributed to interested farmers, safeguarded in CIMMYT’s germplasm bank,
and re-sown next year to begin selection for longer ears. He is also growing out
Jala landrace samples from CIMMYT’s bank for selection and combination with current
landrace materials. In addition to recovery and conservation, Hernández aims to
develop varieties with added value; for example, dual-purpose maize providing
good grain and husk yields, as well as specialized varieties for green ears or
pozole. “This is important for me because, as a genetic resource, it’s unique
in the world,” he says. “Not only that: if we lose this maize we lose our traditions,
culture, and identity.”
Suketoshi Taba, Head of CIMMYT’s Maize Germplasm
Collection, agrees the landrace is a unique expression of Jala’s culture, and
will have value as long as people there choose to grow it. “CIMMYT holds Jala
maize seed in trust, not just as a genetic resource for the world, but also for
the people of Jala,” he says. “It’s important for us to preserve it on a permanent
basis ex situ in the CIMMYT germplasm bank, and this complements its conservation
in the field.” The Center holds 22,600 unique collections of Mexican and other
maize landraces, and has provided seed and technical support to numerous researchers
and farmers interested in their conservation and use.
Many reasons to grow Jala maize
But even if Jala maize can be restored and improved, will farmers continue
growing it? Looking to stem the massive yearly flow of migrants out of the valley,
local officials are tending to support the use of other, more profitable varieties
and crops. “Maize is economically not very important,” says Jala mayor, Juan José
Jacobo Solis.
Jala farmers talk of why they grow the landrace with a mixture of pride and pragmatism.
They take pride in growing the biggest maize in the world, but also in their long
tradition of caring for the seed. Pragmatically, they grow Jala maize for its
high quality, because they enjoy eating it and because it can fetch high prices
locally. The competition offers bothprizes and prestige.
Farmers will continue to grow more profitable and reliable improved varieties
to sell the husks and grain. However, particularly with improved seed and supportive
policies, it is likely that farmers will also continue to grow small plots of
Jala maize for their own consumption and local sale, and for the competition.
Their different purposes are complementary. Ultimately, the conservation of Jala
maize in farmers’ fields is in the hands of farmers, and depends on the value
they place on it.
As such, Jala is relevant to the conservation of other maize landraces: where
people take pride in their local maize and value it for local needs such as traditional
foods, it will be preserved. “I will always grow it,” says farmer José Elias Partida,
“and now my son grows it too, and participates in the competition.”
Source:
CIMMYT E-News, vol 4 no. 8, August 2007 via SeedQuest.com
3 September 2007
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1.19 Researchers looking for flood-tolerant soybeans
Columbus, Ohio
Little can be done to prevent soybean injury due to flooding, but the future is
bright for farmers to grow varieties tolerant to the effects of standing water.
Ohio State University researchers, collaborating
with the University of Missouri-Delta Center, are studying the effects of flooding
on soybean lines in the hopes of identifying tolerance genes that can be bred
into existing susceptible varieties. After one year of research, results look
promising.
“Things so far look good,” said Tara VanToai, an Ohio State University plant scientist
with the U.S. Department of Agriculture-Agricultural Research Service. “We can
tell just by looking at the soybean lines which ones are exhibiting flood tolerance.”
VanToai and her colleagues are analyzing 220 soybean lines that carry the genes
of a tolerant Asian variety and a flood-prone variety. The lines, grown in Missouri
and at the Ohio Agricultural Research and Development Center in Wooster, Ohio,
are being evaluated for yield, plant height, leaf greenness, and level of survival
after fields are flooded.
“We flood the fields until the plants start to show symptoms. Then we quantify
the tolerance of each line under those field conditions,” said VanToai. “Our hope
is that when we compare the data between Wooster and Missouri, we find lines grown
in both locations that are flood tolerant.”
The research, partly funded by USDA-ARS, stemmed from earlier work conducted by
VanToai that found that carbon dioxide buildup in flooded fields is a major cause
of injury and death to soybean plants.
“It was previously suspected that lack of oxygen was the main problem with damaged
or dying soybeans associated with flooding. But what we found was that, although
lack of oxygen played a small part, carbon dioxide build-up was the biggest factor,”
said VanToai. “Carbon dioxide is toxic to plants, causing them to turn yellow,
become stunted and drop leaves, resulting in yield reductions, and, in some cases,
death.”
Researchers discovered that soybean plants adapt to low or no oxygen by producing
additional roots and modifying the stem to help transport oxygen from the shoot
to the roots. Soybeans, however, are susceptible to carbon dioxide. The carbon
dioxide concentration of non-flooded soybean fields is about 1 percent, but increases
to 30 to 35 percent after two weeks of flooding. Soybeans growing under that situation
face yield reductions as high as 60 percent.
“Based on these findings, we were very interested in improving the tolerance of
soybeans to flooding, from the standpoint of saying, ‘Well, if beans lose 60 percent
of their yields after seven days of flooding, then varieties we develop that lose
only 20 percent of their yields would help farmers.’”
Identifying varieties tolerant to carbon dioxide levels in flooded fields or prolonged
standing water is only a piece of soybean research puzzle. Researchers also recognize
the importance of identifying varieties that exhibit resistance to diseases associated
with flooded soil, such as Phytophthora root rot.
OARDC plant pathologist Anne Dorrance is collaborating with VanToai to identify
the genes of flood-tolerance and Phytophthora resistance that can be used to develop
future varieties.
“The cross research is very exciting because it is helping us better understand
the relationship between flooding and diseases, and what it takes to keep soybean
plants alive and grow in flooded soil,” said VanToai.
Other researchers collaborating on the project include Rouf Mian, an OARDC researcher
with USDA-ARS, and Grover Shannon and Henry Nguyen of the University of Missouri.
The soybean is Ohio’s No. 1 field crop commodity, generating over $1 billion to
the agricultural industry, according to the Ohio Department of Agriculture. Soybeans
are grown in Ohio for a wide variety of uses -- from grain to food to renewable
energy production.
Source: SeedQuest.com
August 30, 2007
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1.20 Molecular markers used to breed for
high quality rice varieties
Mohamad, O., Hadzim, K., Azlan, S., Abdullah, M. Z., Zainah, M., Salwa, A.
S., Amiran, N. & Nur Samahah, M. Z.
Universiti Kebangsaan Malaysia & Malaysian Agricultural Research & Development
Institute
Introduction
Rice production in Malaysia is focused in major irrigated areas to sustain the
overall targeted self-sufficiency level of 90%, and rice breeding remains pivotal
for developing improved varieties. Grain elongation on cooking and aroma
are major characteristic of high quality rices, such as Basmati from India and
Pakistan [13]. There is an increasing demand for quality rice in domestic
markets. In 2002, total consumption of specialty rice was 116,930 metric
tons, equivalent to 6% of total national consumption of 1.9 million tons with
retail market value of RM 292.3 million. Almost all aromatic rices are imported,
of which the majority are from Thailand and India [14].
Quality Rice
Due to such demands, MARDI had initiated a special breeding programme to breed
for high quality rices, alongside of the mainstream breeding programme. As a result,
the special programme successfully released two new high quality varieties, namely
MRQ50 (aka Puteri) [19] and MRQ74 (aka Mas Wangi) [14]. Two additional special
quality traits present in these varieties, but not present in previously released
varieties, are grain elongation and aroma of cooked rice.
Grain elongation characteristic is derived from is a mutant line named “Mahsuri
Mutant”, a product of the collaborative research initiated by UKM and MARDI
in 1979 to use induced mutations in rice breeding [2, 17, 18]. Mahsuri mutant
possesses the elongation characteristic very much akin to that found in Basmati
[11, 22], and is found to be controlled by one or two major genes [10].
This is the only known local source of grain elongation characteristic. Consequently,
breeders have targeted the grain elongation of Mahsuri Mutant as one of the invaluable
quality traits. Since then, efforts have been stepped up to transfer this
special trait into elite breeding lines through conventional methods [11, 12].
The internal anatomical structure of grain, cell shape and arrangement might have
influence on the water uptake and the nature of swelling after cooking [21].
Preliminary studies indicated that, the internal cracks for Mahsuri Mutant was
substantially increased when it was artificially aged [10].
The aroma of Basmati and Jasmine rices has been associated with increased levels
of 2-acetyl-1-pyrroline, the key aroma constituent of aromatic rice [3]. The aroma
gene is reported to be located on chromosome 8. Many of our traditional
varieties have aroma, and there was only little effort to utilize the trait from
such varieties [1, 16].
Conventional breeding
In rice improvement, breeding lines are rigorously evaluated for many desirable
morpho-agronomic and quality traits before they are released as new varieties
to growers. Screening and evaluation procedures for these traits are usually
laborious and expensive, particularly so when grain elongation and aroma are further
included. These two traits are difficult and tedious to assay using the
present method of assessment. Furthermore, both have additional problems;
they are strongly influenced by the environmental factors, and this could lead
to misevaluation during selection and evaluation. Rice breeders in Malaysia
have already started to breed for high quality rices, where aroma and kernel elongation
are major components in the high quality breeding programme. Thus far MARDI has
released MRQ50 which has kernel elongation and MRQ74 which has aroma.
Molecular breeding
Molecular marker technology provides new opportunities for innovative use in rice
breeding. To date, a range of genes controlling quality characteristics
in rice have been tagged. In spite of the fact that some technical constraints
and high costs are still prevalent, the use of molecular markers in our rice breeding
programme has been increasing [15]. Rapid detection methods for grain elongation
and for aroma are needed to supplement the present methods which are difficult
and tedious, e.g. sensory method may be used to assist breeders in establishing
the presence of aroma volatiles in rice, but there are limitations when processing
large numbers of samples. Molecular breeding requires small amounts of tissues
and allows a more accurate analysis of greater sample numbers in less time. Plants
from breeding programs could be assessed in the early stages of cultivar development,
thus offering additional advantage of early screening of breeding populations
compared to other methods.
Materials and Methods
To assess the effectiveness of the PCR-based markers within the Malaysian rice
varieties, the marker alleles were characterised for 40 samples including Mahsuri
mutant, MRQ 50 and MRQ 74. The rice samples analysed included 38 Malaysian breeding
lines and released varieties, and Basmati 370 and Khao Dawk Mali as control varieties.
The usual assessment methods employed to determine grain elongation and aroma
were as described by Sood et al. [20], Golam et al. [10] and Berner & Hoff
[4]. Primer sequences for selected markers are available [5, 6, 7, 8, 9,
23].
Results and Discussion
Three sets of primer for grain elongation and 10 sets of primer for aroma were
used. PCR amplifications analysis showed that all the selected and synthesised
primers were functional and useful as a selection tool to identify the rice varieties
for grain elongation and aroma. As for grain elongation, the expected fragment
size between grain elongation and non-grain elongation could not be discriminated
by agarose gel electrophoresis. As for aroma, the most suitable marker which allows
discrimination between aromatic and non-aromatic rice varieties, and also identifies
homozygous aromatic, homozygous non-aromatic and heterozygous non-aromatic varieties
are EAP, ESP, INSP and IFAP primer [6]. The PCR product of approximately 580 bp
serves as a positive control amplified by both external primers (EAP and ESP).
Aromatic varieties have a second product of 257 bp in size while non-aromatic
varieties give a product of 355 bp on size, and heterozygotes can also be discriminated
by the presence of all three PCR products (Fig. 1). The 355 bp band corresponds
to a PCR product amplified from the non-aromatic allele by the internal non-fragrant
sense primer (INSP) and the external antisense primer (EAP). The 257 bp band corresponds
to a PCR product amplified from the aroma allele by the internal fragrant antisense
primer (IFAP) and the external sense primer (ESP).
In this analysis, about 17 Malaysian rice varieties over 38 Malaysian rice varieties
tested i.e. Pongsu Seribu II, Biris, Pongsu Seribu Mutant PS 1297; Padi Wangi
6893, Padi Wangi 9285, Champa, Kuku Belang, Anak Cina, Dang Laka, MRQ 50, MRQ
70, MRQ 72, MRQ 74, Coreng, Siam Pilihan, IR841-85B and Padi Wangi 9366 could
be identified as aromatic varieties. Whereas about 15% typical aromatic/non-aromatic
individuals were inconsistent between genotypes and phenotypes. It is speculated
that some aromatic individuals might have been mistakenly classified into non-aromatic
group or vice-versa due to subjective assay of aroma through sensory analysis.
Conclusion
Rice breeders have already started to breed for high quality rice, where grain
elongation and aroma are major components in the special high quality breeding
programme. The use of molecular markers for aroma has shown excellent results.
However, for grain elongation, results are still inconclusive since intensified
work is currently being undertaken. Molecular markers closely linked to
aroma have now been identified, and these can be readily used and applied as a
new tool in our local breeding programme. This will enable rice breeders
to select for aroma rapidly and involving larger populations, and perhaps, will
also mark the dawn of the era of molecular rice breeding in Malaysia.
Acknowledgements
The research is funded by the Ministry of Science, Technology and Innovation (MOSTI),
Malaysia under ScienceFund Grant No: 02-01-02-SF0056. The authors wish to express
their gratitude to UKM, MARDI, Bioversity International, International Rice Research
Institute and other agencies and individuals for their support and assistance.
Note: This article is extracted from a PECIPTA 2007 poster sent by the first author.
PECIPTA 2007 Exhibition was held on 10-12 August 2007 in Kuala Lumpur. For
a complete copy of the poster, including photos, figures and references, please
contact Dr. Mohamad bin Osman, below.
Dr. Mohamad bin Osman
School of Environmental and Natural Resource Sciences
Faculty of Science and Technology
Universiti Kebangsaan Malaysia, Bangi
mbopar2004@yahoo.com.my
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1.21 Cornell University researchers clone aluminum-tolerance
gene in sorghum, promising boost to crop yields in developing world
By Krishna Ramanujan
When soils are too acidic, aluminum that is locked up in clay minerals dissolves
into the soil as toxic, electrically charged particles called ions, making it
hard for most plants to grow. In fact, aluminum toxicity in acidic soils limits
crop production in as much as half the world's arable land, mostly in developing
countries in Africa, Asia and South America.
Now, Cornell University researchers have
cloned a novel aluminum-tolerant gene in sorghum and expect to have new genetically-engineered
aluminum-tolerant sorghum lines by next year.
The research, to be published in the September issue of Nature Genetics, provides
insights into how specialized proteins in the root tips of some cultivars of sorghum
and such related species as wheat and maize can boost aluminum tolerance in crops.
Sorghum is an important food crop in Africa, Central America and South Asia and
is the world's fifth most important cereal crop.
"My lab has been working to identify the physiological mechanisms of plant aluminum
tolerance as well as its molecular basis," said Leon Kochian, the paper's senior
author, a Cornell adjunct professor of plant biology and director of the U.S.
Department of Agriculture--Agriculture Research Service (USDA-ARS) Plant, Soil
and Nutrition Laboratory at Cornell. "The reason this is significant is there
are extensive areas of the earth's lands that are highly acidic, with pH of 5
or below [pH below 7 is considered acidic]. Most of these areas are in the tropics
or subtropics, where many developing countries are located."
Kochian's research shows that in aluminum-tolerant sorghum varieties, special
proteins in the root tip release citric acid into the soil in response to aluminum
exposure. Citric acid binds aluminum ions very effectively, preventing the toxic
metal from entering the roots.
Kochian and colleagues, including the paper's first author, Jurandir Magalhaes,
who received his Ph.D. from Cornell in Kochian's lab and now directs his own lab
at the Embrapa Maize and Sorghum Research Center in Brazil, used genetic mapping
to identify a single gene that encodes a novel membrane-transporter protein responsible
for the citric acid release. The gene, they discovered, is only turned on to express
the protein and transport citric acid when aluminum ions are present in the surrounding
soil.
The researchers have now used the sorghum gene to engineer transgenic aluminum-tolerant
Arabidopsis thaliana (a small mustard plant used in plant research because of
its small genome and short life cycle) and wheat plants. Sorghum is harder to
genetically transform, Kochian said.
The map-based cloning of this agronomically important gene in sorghum is helping
advance this species as a model for further exploring the mechanisms of aluminum
tolerance and discovering new molecular genetic solutions to improving crop yields,
Kochian said.
"This research also has environmental implications for badly needed increases
in food production on marginal soils in developing countries," said Kochian. "For
example, if we can increase food production on existing lands, it could limit
encroachment into other areas for agriculture."
The research is supported in part by the McKnight Foundation Collaborative
Crop Research Program, the Generation Challenge Program, the National Science
Foundation and the USDA-ARS.
Source: SeedQuest.com
28 August 2007
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1.22 Scientists seek new ways to control potato pests
Washington, DC
ARS News Service
Agricultural Research Service, USDA
Ann Perry, (301) 504-1628, ann.perry@ars.usda.gov
New and more virulent forms of two scourges that rampaged through potato fields
in the past--the golden nematode (Globodera rostochiensis) and potato virus Y
(PVY)--are making a comeback. But Agricultural Research Service (ARS) scientists
are catching up to them.
Twenty years ago, stringent controls eventually confined the golden nematode--also
called the potato cyst nematode--to several counties in New York, where it was
first discovered. However, more than 30 varieties of potatoes that were previously
nematode-resistant are now vulnerable to attack from a new race of the golden
nematode, dubbed "Ro2."
Xiaohong Wang, a molecular biologist in the Plant Protection Research Unit (PPRU)
at Ithaca, N.Y., is using molecular biology techniques to study specific parts
of Ro2 DNA. This will help speed its field identification. She is also looking
for ways to increase potato resistance to Ro2 using a method called RNA interference
(RNAi), which interferes with gene expression.
A pathogen of potatoes as well as tomatoes, peppers and tobacco, PVY dramatically
affects produce yield and quality. Although seed potatoes are screened for PVY,
its resurgence is due in part to varieties that are symptomless carriers of the
virus. Some PVY strains have also become more virulent over time.
Plant pathologist Stewart Gray, also at the PPRU, is coordinating a survey of
all U.S. potato seed-production areas to determine PVY's genetic diversity and
distribution in the United States. This is one part of a plan developed by an
international team of scientists, regulatory personnel and industry representatives
to manage potato viruses that result in tuber necrosis. These strategies will
help stem the spread of PVY, and should help prevent necrotic PVY strains from
becoming predominant in North America.
ARS research on these pathogens will help the potato industry remain viable and
boost producer efforts to expand their markets.
ARS is the U.S. Department of Agriculture's chief scientific research agency.
Read more about this research in the August issue of Agricultural Research
magazine, online at: http://www.ars.usda.gov/is/AR/archive/aug07/potatoes0807.htm
Source: SeedQuest.com
29 August 2007
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1.23 Breeding citrus rootstocks: promising hybrids in Brazil
Citrus rootstocks - At the start of citrus cropping only plants derived
from seeds were used. This was attractive because it was easy, produced long-lived
plants and excluded viruses. However, the advantages of standardization, start
of early bearing yield and dissemination of Phytophthora in the world made
bud grafting on rootstocks derived from seeds the universal method of propagating
commercial citrus plants. Biologically speaking, the rootstock and scion are symbiotic
entities artificially formed by two botanical species, often from different genus,
that have to interact harmoniously and efficiently through the grafting region.
It is interesting to note that in spite of the coexistence in the plants of such
extraordinary genetic and physiological divergence the citrus orchard thus formed
is genetically uniform, because the canopies are, via bud grafting, vegetative
propagations of a single clone as the rootstocks since they are apogamic reproductions
of the mother tree by seed nucellar embryony. As a result of complex interactions,
rootstocks affect dozens of industrial, agronomic and plant health traits related
to the fruits and plants of the canopy cultivars grafted on them. Its importance
was expressively stated by the knowledgeable USDA scientist Heinz K. Wutscher
“… rootstocks have contributed perhaps more than any other factor to the success
or failure of the citrus industries in the world”. Indeed, the history of rootstocks
in Brazil and elsewhere is mixed with the feasibility of the crop, industry implantation
and with the dynamics of its progress. Substitution of the Caipira sweet orange,
Sour orange, Rangpur lime and the Volkamer lemon rootstocks became classic because
of trunk gummosis , CTV incidence, decline and sudden-death.
The breeding work - In the face of the biological vulnerability of the
Brazilian world’s leading citrus cropping largely based on Rangpur lime and few
other rootstock types, a breeding program has been carried out since 1990 at the
Instituto Agronômico de Campinas (http://www.iac.sp.gov.br)
to obtain, via hybridization and selection, rootstocks that associate favorable
traits of the commercial clones Trifoliata orange ‘Davis A’ (Poncirus trifoliata)
(T), Sunki mandarin ‘200’ (Citrus sunki) (S), Rangpur lime ‘Limeira’ (Citrus
limonia) (C) and Sour orange ‘São Paulo’ (Citrus aurantium) (A). The
study comprised the parents represented by 138 nucellar clones and 534 hybrids
of them identified by seven isoenzymatic and two morphological markers, forming
seven groups of crosses (TxS, SxT, SxC, SxA, CxA, TxA and CxS). During the execution
of the breeding program the technique of controlled hybridizations has been improved,
electrophoresis isoenzymatic marker methodologies developed, petiole wing marker
used with the trifoliolate leaf marker to identify the hybrids produced. Because
of the importance and implications in citrus rootstock breeding in Brazil, the
genetic mechanism conditioning tolerance to citrus tristeza virus (CTV) was investigated,
as well as the effect of CTV on canopy agronomic and industrial traits, resistance
to trunk gummosis and root tolerance to Phytophthora nicotianae. Parents
and hybrids bud grafted with Valencia orange were studied for the yield of the
first seven harvests, plant traits at eight years of age and the implications
on productivity per area, crop efficiency of canopy, volume and theoretical tonnage.
Preliminary tests were carried out to ascertain the induced industrial quality
on the canopy. Fruits, seeds and descents of some hybrids were observed. Tolerance
to citrus tristeza virus (CTV), trunk gummosis and Phytophthora root rot
were also considered for selection purposes. Their selection potential was assessed
based on the above considerations prioritizing however total yield, CTV, trunk
gummosis and Phytophthora tolerance.
The potential of selected hybrids - It is evident that no rootstock will
be ideal for all situations, considering the large number of agroindustrial requirements
and the biological and edafo-climatic diversities that interact with the canopy/
rootstock combinations. However, some general criteria are necessary to estimate
the potential of hybrids for selection purposes. For use in Brazil, any rootstock
for sweet oranges and most other citrus must necessarily be CTV tolerant and give
high yields and/or productivity per area. Based on the existence of genetic variability
visually observed and detected by genetic parameters and taking as reference the
confidence interval of the mean of the T, S and C parents with t at 95% probability,
the potential as rootstock of the different genotypes was assessed. Of the 534
hybrids studied, 394 were CTV tolerant, of which 173 (44%) induced accumulated
yield (kg) greater than Trifoliate orange, 119 (30%) greater than Sunki mandarin,
75 (19%) greater than Rangpur lime; 76 (19%) presented higher productivity (kg/m2)
than Trifoliate orange, 149 (38%) higher than Sunki mandarin and 65 (16%) higher
than Rangpur lime; 166 (42%) greater yield efficiency (kg/m3) than
Sunki mandarin, 81 (21%) greater than Rangpur lime and 54 (14%) were more efficient
than Trifoliate orange. These results are in line with the levels of the three
parameters of these parents, because, Trifoliate orange and Rangpur lime induce,
respectively, the smallest and greatest canopy yield, and greater productivity
per area than Sunki mandarin. Trifoliate orange further presented greater efficiency
than Rangpur lime. The Trifoliate orange high productivity and efficiency traits
were transmitted to its hybrids. Ninety (23%) of the 394 CTV tolerant hybrids
were selected jointly by the criteria trunk gummosis and Phytophthora root
rot resistance, accumulated yield in seven years, productivity and production
efficiency of Valência orange grafted on them. The hybrids in the TxS and SxT
groups are specially outstanding and were selected in proportionally greater percentages
due to good yield performances and to their general reaction to Phytophthora.
Whether by the results from trunk inoculation or from root infection, they formed
a group of individuals generally superior to the Rangpur lime and some presented
tolerance levels similar to Trifoliate orange. Altogether 90 hybrids were selected
for future research and trials as potential rootstocks: 12 TxS, 29 SxT, 23 SxC,
13 SxA, 7 CxA, 5 TxA and 1 CxS. For better characterization and use as minimum
descriptors it is indicated, for each selected hybrid, the genotypes of seven
isoenzymatic loci, two loci that govern CTV tolerance and the leaf phenotype in
addition to their yield potentials, production efficiency, theoretical tonnage,
trunk gummosis and Phytophthora root rot tolerances.
General remarks - The investigations indicated that the agroindustrial
traits and performance induced by the Trifoliate orange, Sunki mandarin, Rangpur
lime and Sour orange parents, ascertained by use and extensive experimentation
as rootstocks in Brazilian citrus cropping, were widely corroborated by the data
obtained. The study of the hybrids per se, their nucellar progenies and
the Valencia orange canopies grafted on them showed, compared to the parents the
existence of considerable genetic variability, not only among the seven groups
of hybrids analyzed, but also among the representatives of each group. This variability
suggests the correctness in the choice of the crosses carried out and the relevance
of selecting hybrids that associate combinations of favorable traits present in
the different parents. In November 2003, the plants were cut back to soil level
and from the sprouting of these rootstocks five buds from each one of the 90 selected
hybrids were grafted on Rangpur lime, introduced as new accessions in the Germplasm
Collection of the Centro de Citricultura Sylvio Moreira ( http://www.centrodecitricultura.br)
of the Instituto Agronômico, Brazil, and field transplanted at Cordeirópolis in
November 2005. The potential of the hybrids should be considered as a reference,
since their nucellar progenies need to be assessed as rootstocks in extensive
tests and under several plant health conditions. Because Sunki mandarin is tolerant
to decline, sudden-death and to the Capão Bonito CTV strain, it would be strategic
that such investigations be also conducted in situations that permit assessment
of these hybrids for tolerance to these factors. It would be important for citrus
producers themselves, and of great value to citrus cropping science, if these
investigations were carried out with representative participation of main producing
regions. Recently (
http://www.vivecitrus.com.br/imagembank/Docs/DocBank/%C3%81rea%20Tecnica/Daves%20Setin%20-%20Muda%20turbinada.pdf
), an interesting modality of seedling has been experimented where nursery inarch
is performed with an alternative rootstock for possible complementation of attributes
of the two different rootstocks. By confirming the superiority of these plants,
the advantages could be further extended using a combination of two hybrids of
different species. Thus, up to four different rootstock species could participate
simultaneously in each plant of the orchard, supposedly decreasing the biological
vulnerability that results from the use of a single rootstock.
Abridged by Rita Bordignon and Herculano P. Medina Filho from the original article
“SELECTED CITRUS ROOTSTOCK HYBRIDS INTRODUCED INTO THE GERMPLASM COLLECTION OF
THE INSTITUTO AGRONÔMICO” (R. Bordignon; H. P. Medina Filho; W. J. Siqueira; L.
A. Ambrósio; A. Conagin; R. M. Pio; J. Pompeu Junior; J. Teófilo Sobrinho; M.
A. Machado) available at http://www.iac.sp.gov.br/BTonline/Boletim_Cientifico_14.pdf
Contributed by H. P.Medina Filho / Rita Bordignon
Centro de Café Alcides Carvalho
Instituto Agronômico
Campinas, SP, Brazil
medina@iac.sp.gov.br
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1.24 Two key findings steer cucumber disease research
Michigan is still the No. 1 state in pickling cucumber production, but a readily
spread disease infecting up to 50 percent of the state’s cucumber acreage threatens
to put an end to that claim and jeopardizes the future of several other important
vegetable crops.
The culprit is Phytophthora capsici, a funguslike organism that infects plant
roots, fruits and foliage and causes a blight, or rot, to appear on the infected
parts of plants in several families of crops: the cucurbits (cucumber, pumpkin,
gourd, watermelon, cantaloupe, and summer and winter squash) and solanaceous (tomato,
eggplant and pepper) families, as well as lima, wax and snap beans. Infection
reduces yields and can kill plants outright within a few days. In 2006, Michigan
growers produced $132 million worth of these vegetables on more than 83,000 acres.
When weather conditions are favorable for Phytophthora (warm with rain), crop
losses can reach 25 percent or higher.
“The economic losses from Phytophthora can be devastating,” says Mary Hausbeck,
Michigan State University (MSU) professor of plant
pathology and lead researcher on the Phytophthora project. “When a farm in southern
Michigan was unable to harvest 300 acres of diseased pickling cucumbers because
of Phytophthora, an estimated $300,000 was lost. This was in addition to a $40,000
loss on approximately 100 acres of processing tomatoes.”
Because of the economic importance of these vegetable commodities to Michigan
and the threat that the disease presents to the state’s growers, plant pathology
researchers at MSU are seeking to identify strategies for understanding and controlling
Phytophthora, which can persist in soils in the absence of a host for more than
10 years. They cite two findings as key.
The first discovery dates back to 1999, when they learned that Phytophthora had
become highly resistant to the primary fungicide that growers had been using to
control it.
“This meant that growers were spending a lot of money on a product that could
not help them,” Hausbeck says. “This finding caused the pickle industry to shift
to using alternative products that did work and helped Michigan acquire a Section
18 registration that some other states did not have.”
The second key finding, from research conducted between 2002 and 2005, is that
some of the water sources that farmers were using to irrigate their crops were
contaminated with the Phytophthora pathogen. In standing water, Phytophthora produces
swimming spores that can be spread through moving water. The pathogen can survive
and cause infection for 8 to 10 hours, long enough to be spread over many acres
through irrigation.
“The significance of this finding is huge because large parcels of farmland can
become infected with Phytophthora after just two waterings with contaminated water,”
Hausbeck says. “That land is infected forever, so growing vegetables there ever
again is risky.”
Hausbeck says that, prior to this project, little was known about how Phytophthora
spread so quickly and why it was a particular problem in fields where vegetables
had never been grown in the past. For example, nearly 4,000 acres of vegetable
crops were affected when P. capsici was discovered in the Pentwater River, a major
waterway used as an irrigation source. In response to this finding, six wells
were drilled to provide supplies of clean irrigation water for these farms.
“Discovering that this pathogen can be spread through irrigation water has been
the hardest one for growers to resolve,” she says. “Irrigating with well water
is safe, but using surface water from ponds, rivers, creeks or ditches is not,
especially if there is a history of Phytophthora in the region. Phytophthora is
not visible to the naked eye, and the cleanest-appearing ponds can be contaminated
with it, so it can be difficult for growers to understand why they must shoulder
the expense of digging a well.”
And what messages should growers take to heart?
“If irrigation is necessary, refrain from using surface water sources,” Hausbeck
says. “Instead, use drip irrigation from well water or ponds fed by well water
to reduce the risk of spreading Phytophthora.”
It’s also recommended that growers irrigate conservatively and limit irrigation
close to harvest time.
MSU researchers are continuing to evaluate new products with potential for managing
Phytophthora. Monitoring of irrigation water sources for Phytophthora continues,
and scientists are initiating research to determine the role that water temperature
plays in the pathogen’s survival. Project GREEEN, Michigan’s plant agriculture
initiative at MSU, continues to provide funding in support of this work.
“Project GREEEN has been there since the beginning, and it was key to helping
us secure the funds necessary to acquire the technical expertise needed to identify
the fungicide resistance problem,” Hausbeck says. “Phytophthora research and the
grower recommendations resulting from it would not have been possible without
funding from Project GREEEN.”
Founded in 1997, Project GREEEN (Generating Research and Extension to meet Environmental
and Economic Needs) is a cooperative effort between plant-based commodities and
businesses together with the Michigan Agricultural Experiment Station, MSU Extension
and the Michigan Department of Agriculture to advance Michigan’s economy through
its plant-based agriculture. Its mission is to develop research and educational
programs in response to industry needs, ensure and improve food safety, and protect
and preserve the quality of the environment.
To learn more about the state’s plant agriculture initiative at MSU, visit www.greeen.msu.edu.
Source: SeedQuest.com
17 August 2007
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1.25 Challenges remain in reintroducing American chestnut
WEST LAFAYETTE, Ind.
Researchers have developed a breed of American chestnut that is resistant to the
fungal blight that decimated its population in the early 1900s.
But the return of this "king of trees," so-called for its picturesque form and
towering height of more than 100 feet, remains hampered by a slew of obstacles,
said a Purdue University researcher."We are on the verge of overcoming chestnut
blight, but there is a whole new set of obstacles to get past yet," said Douglass
Jacobs, an associate professor of forestry and natural resources who is helping
develop the blight-resistant chestnut.
To reintroduce the American chestnut, he said, researchers must get past several
policy limitations, gather new data, educate the public about the species and
address new threats posed by exotic pests. He details these and other challenges
in a paper published in July's issue of the journal Biological Conservation.
Once a dominant forest species throughout much of the Eastern United States, ranging
from Maine to Mississippi and concentrated in the Appalachian regions, the American
chestnut was known for its annual largesse of nuts, rot-resistant wood and sheer
size. An introduced Asian fungus nearly eliminated the tree.
A breeding program begun by the American Chestnut Foundation recently produced
a blight-resistant hybrid tree that derives its resistance from the Asian chestnut
and contains 94 percent of the American chestnut's genetic material, Jacobs said.
Nevertheless, the supply of blight-resistant trees remains low, and the tree isn't
likely to be available to the public for about a decade. More resources need to
be directed toward breeding programs, he said.
More existing trees also need to be included in breeding programs as soon as possible
to produce a genetically diverse population, Jacobs said. Although few adult chestnuts
remain throughout the tree's native territory, a significant number of sprouts
persist from old tree roots, which grow for years before becoming reinfected.
These sprouts comprise a level of genetic diversity that is vital for widespread
reintroduction and need to be included before they die out altogether, Jacobs
said.
One of the biggest obstacles is the host of laws and regulations that now govern
the forests - or former forests - in the chestnut's original range, Jacobs said.
In many public lands where the chestnut used to thrive, such as the Great Smoky
Mountains National Park, human interference is strongly discouraged and often
illegal. But Jacobs said some interference and harvesting will be necessary to
reintroduce the chestnut, calling for a unified and proactive approach and exceptions
to certain laws that govern public lands.
Jacobs said that some might consider the blight-resistant chestnut hybrid as a
cultivar or new species, which could hamper reintroduction to public lands. However,
he stressed that just because the tree is crossed with the Asian chestnut to attain
resistance, its physical traits and appearance should be indistinguishable from
a pure American chestnut.
"This is as close to the real thing as it gets," Jacobs said. "Any closer and
it wouldn't be blight-resistant."
Further breeding should produce even higher quality trees, he said.
In the early 1900s, the blight hit so fast that researchers didn't have time to
study the American chestnut's ecology or interactions with its environment, Jacobs
said. Thus, more research is needed to better understand the species and determine
how to best reintroduce it into existing forests.
Jacobs recently conducted a study in Wisconsin where the fungus hadn't yet spread,
demonstrating that the chestnut grew extremely fast, outcompeting native black
walnut and red oak trees. The average chestnut grew to 23 feet by age 8.
"This confirmed what we had thought," Jacobs said. "The American chestnut is very
fast-growing and competitive, has excellent timber and has great wildlife properties,
all which make it a desirable species for reintroduction."
However, new exotic pests also threaten the chestnut. Blight-resistant hybrids
have already proven susceptible to Phytophthora cinnamomi, or root rot,
which preys upon tree roots in mostly wet, southern soils.
"This threatens to be almost as bad as the fungal blight," Jacobs said. "In the
future, we may need to select for this resistance in new hybrids. Luckily, the
Asian chestnut shows some resistance to this fungus as well, although the breeding
process would take a long time."
Jacobs said the tree could be ecologically less desirable in some areas.
"It's a natural choice for hardwood plantations in the Midwest and Mississippi
Valley, but these areas are largely outside its native range," he said.
The chestnut could threaten native species outside its range since it is competitive
and quick-growing, he said.
If individuals or groups decided not to accept the hybrid American chestnut as
a native species, and this in turn impeded its reintroduction, it would likely
encourage more research into ways to genetically engineer the tree, especially
since it has potential as a profitable species, Jacobs said.
"This would likely be less acceptable to those who would think twice about reintroducing
a hybrid of a native tree, and it would be difficult to prevent without a better
alternative," he said.
Writer: Douglas M. Main dmain@purdue.edu
Source: Douglass Jacobs djacobs@purdue.edu
Ag Communications;
Beth Forbes, forbes@purdue.edu
Agriculture News
Page
Source: EurekAlert.org
21 August 2007
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1.26 Same gene protects from one disease, opens door to
another
Corvallis, Oregon
Botanists at Oregon State University (OSU) have discovered that
a single plant gene can cause resistance to one disease at the same time it produces
susceptibility to a different disease – the first time this unusual phenomenon
has ever been observed in plants.
The finding, published this week in Proceedings
of the National Academy of Sciences, may help scientists better understand
the pathways that genetic disease resistance can take. Plant diseases are a multi-billion
dollar problem in agriculture, and scientists for decades have been trying to
develop new varieties of plants with resistance to one disease or another.
The research also explains why an epidemic of “Victoria blight,” a fungal disease,
occurred in the United States in the 1940s. The Pc-2 gene in a widely-planted,
imported variety of oats provided good resistance to oat rust, which is a costly
crop disease – but the same gene also caused susceptibility to Victoria blight,
and its use had to be discontinued as a result.
“The blight fungus makes a toxin that causes disease in susceptible plants – that
is, only plants that carry this gene,” said Jennifer Lorang, an OSU research associate.
“But it also turned out that the same gene can provide disease protection. This
is very unusual, and should provide insight into genetic influences on disease
resistance and susceptibility.”
Most work that has been done on plant diseases is focused on disease resistance,
the researchers said, and less has been done on the genetic basis for disease
susceptibility.
Among other things, the study suggests that plants bred for resistance to one
disease may inadvertently be changed in ways that make them susceptible to a different
disease. It also indicates that the physiological basis for disease resistance
and susceptibility may have some similarities.
The actual plant used to identify these genetic pathways was Arabidopsis, a small
plant in the mustard family, which is frequently used for genetic research. The
scientists put the Pc-2-like gene in Arabidopsis, which has a similar function
in oats, and were able to determine that it causes disease susceptibility, although
it looks like a resistance gene.
Co-authors on the study were Tom Wolpert, a professor of botany and plant pathology,
and Teresa Sweat, a doctoral student. The research was supported by the National
Research Initiative of the USDA Cooperative State Research, Education and Extension
Service.
Source: SeedQuest.com
28 August 2007
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1.27 Partial sequencing of the barley genome
planned
Farmers, biofuel enthusiasts, and, yes, brewmasters could soon get a little
enlightenment from German plant geneticists. Last week, the German government
put up $8 million to more fully map and partially sequence the genome of barley,
a key crop used worldwide in animal feed, human food, and beer.
Funding agencies have been slow to tackle crops such as wheat and barley because
of the daunting size of their genomes. At 5 billion bases, barley’s genome is
nearly double the size of the human genome. But it is only one-third wheat’s size
and lacks that genome’s multiple copies, so it should be easier to sequence, says
plant geneticist Nils Stein of the Institute of Plant Genetics and Crop Plant
Research in Gatersleben, Germany, whose team will create a draft sequence of 10%
of the genome. Stein hopes the work, along with a British-led barley sequencing
pilot, will set the table for a large-scale sequencing project.
Elizabeth Pennisi
Source: Science, 24 August 2007, Vol 317
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1.28 Eco-tilling detects resistance
DPI molecular biologist, Dr Mui-Keng Tan, together with a team of researchers
from Japan, has developed ‘ecotilling’ - a quick, cheap and reliable means of
detecting early signs of herbicide resistance in weeds.
A new molecular tool developedby Australian and Japanese researchers is expected
to help farmers address what has become one of the major threats to conventional
agricultural practices - herbicide resistance.
More than 305 types of weed in more than 50 countries have been reported to be
resistant to at least one herbicide, and an increasing number of weeds owe their
success to their genetic diversity.
Scientists say techniques are needed to detect mutations when they first occur,
so farmers can test for herbicide resistance in the field and manage weeds accordingly.
NSW Department of Primary Industries (DPI) molecular biologist,Dr Mui-Keng Tan,
together with a team of researchers from Japan, investigated a technique called
ecotilling and found it offers a quick, cheap and reliable means of detecting
early signs of herbicide resistance in weeds.
Unlike the traditional molecular approach, eco-tilling uses reverse genetics.
Genes are not fully sequenced; instead, mutations in single molecules that make
up genes are identified purely on the basis of their position in the genome.
Dr Tan said new mutations can be detected and known ones can be screened for a
fraction of the cost of alternative genetic methods.
This makes it a powerful, low cost and high throughput alternative to full sequencing.
Dr Tan has been investigating the technique with Dr Guang-Xi Wang from Kyoto University,
who was funded by the Grains Research and Development Corporation to collaborate
with Dr Tan at DPI’s Elizabeth Macarthur Agricultural Institute at Camden.
She says the use of the eco-tilling technique to test for resistance could help
farmers to manage herbicide use in crop rotations more economically and effectively.
Dr Tan’s research has focused on herbicide resistance in two oft he most significant
weeds affecting Australian cropping systems -wild oats and rye grass - and to
together with Dr Wang she also examined weeds in rice fields inJapan.
Dr Tan said the every weed-herbicide system is specific.
"The ecotilling technique can beapplied on any particular system, pending availability
of molecular data on the target genes of theherbicides," she said.
An article on the research in Japan was published recently in the international
journal Pesticide Biochemistry and Physiology.
Contact Mui-Keng Tan, Camden mui-keng.tan@dpi.nsw.gov.au
- Joanne Finlay
Source: EurekAlert.com
August 2007
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1.29 Scientists harvest answers from genome of grain fungus
EAST LANSING, Mich. Evil forces thrive in an unstable environment.
At least, that’s the picture being painted in the first waves of data being reaped
from the genome sequence of the fungal plant pathogen, Fusarium graminearum. The
sequencing has provided scientists a road map to someday combat a fungus that
infects wheat and barley crops, rendering them unusable.
In the Sept. 7 edition of the journal Science, Frances Trail, Michigan State University
associate professor of plant biology and of plant pathology, and Jonathan Walton,
professor in the MSU-Department of Energy (DOE) Plant Research Laboratory, joined
scientists around the world in picking over the inner workings of the fungus.
The discovery: The real estate in some parts of the chromosomes, where many switches
of disease and toxins reside, is unstable. Other areas of the chromosomes, where
basic metabolism and other vital functions dwell, are stable.
“Those unstable areas are places where the organism is ready to evolve,” Trail
said. “In those genes there’s a lot of mutation. They can change a lot without
killing the fungus. The genes that are involved in basic metabolism can’t change
without killing the fungus.
“We’re starting to see this kind of a pattern as genomes have been looked at.
It tells us something about what makes a pathogen a pathogen.”
Understanding the layout of the genome is a high-stakes proposition. This fungus
is a serious pathogen of wheat and barley in Michigan and throughout the Midwest.
It causes Fusarium head blight, which reduces grain yields, and taints grain with
mycotoxins that have been found to be detrimental to human and animal health.
Fusarium begins its blighting ways as pinprick-sized pods that spit spores into
the air. The spores float over grain fields, landing on flowering wheat and barley.
The spores colonize the wheat flowers. The often cool, wet weather of the Midwest
provides an ideal environment for the fungus to take hold.
The result: fields of blight, identified by withered, bleached heads of grain.
At harvest, many of the grains are shrunken and white, and harbor the mycotoxins.
The fungal plant pathogen has some 14,000 genes sequenced. Trail said the roles
of some of them are understood, including which ones help form the spores or help
produce toxins. Trail’s team figures that there are 2,000 genes dedicated to making
the spores.
“Those spores have to get out to cause the new disease cycle,” she said. “If we
can figure out that whole mechanism, it’s likely that we can figure out a way
to control it.”
Understanding the sequence is the first step in the process. From there, the task
is understanding the makeup of the genes – where they’re strong and organized,
where th