AGP - 
 

Differential Sets

Differential sets are a vital component of race analysis. The aim is to have a set of differential varieties, ideally each with a different single resistance gene, which can distinguish races by their qualitative differences in reactions to different pathogen strains. Numerous different differential sets are in use by rust labs undertaking race analysis on a routine basis. 

This current lack of consistency in differential sets between rust labs makes international comparison of results extremely difficult. As a result of the recognition of the emerging threat posed by new races of stem rust like Ug99 and the clear need for global collaboration and consistency, a new international set of differentials has been agreed upon by a panel of global rust experts. Partners in the BGRI are now using the following international core set of differentials to ensure global consistency for race analysis. Optional additions to the international core set can be made by individual labs to cover local needs.

For more information about obtaining seed of the International core diferential set. Please contact:

Dr. K. Nazari, ICARDA, P.O. Box 5466, Aleppo, Syrian Arab Republic. Email: K.Nazari@cgiar.org

Dr. T. Fetch, AAFC, Cereal Research Centre, 195 Dafoe Road, Winnipeg, Canada R3T 2M9. Email: Tom.Fetch@AGR.GC.CA

BGRI International Core Differential Set – Stem Rust (ordered by sets used in North American nomenclature system)

Set

Gene

LIT

Diff line for world distribution, April 2009

Origin/Pedigree

Source

1

Sr5

0

ISr5-Ra CI 14159

Thatcher/Chinese Spring

Jin, USDA

 

Sr21

1-

T monococcum/8*LMPG-6 DK13

Einkorn CI 2433

Fetch, AAFC

 

Sr9e

1- to 2-

Vernstein PI 442914

Little Club //3* Gabo /2* Charter /3/3* Steinwedel / CI 7778

Jin, USDA

 

Sr7b

2

ISr7b-Ra CI 14165

Hope/Chinese Spring

Jin, USDA

2

Sr11

; to 2-

Yalta PI 155433

Kenya C6402/Pusa4//Dundee

Park, Australia

 

Sr6

0;

ISr6-Ra CI 14163

Red Egyptian/Chinese Spring

Jin, USDA

 

Sr8a

2- to 2

Mentana W1124 PI 221154

Rieti / Wilhelmina // Akagomughi

Park, Australia

 

Sr9g

2-

Acme CI 5284

Selection from Kubanka (CI 1516)

Pretorius, SA

3

Sr36

0;

W2691SrTt-1 CI 17385

CI 12632 T. timopheevii

Jin, USDA

 

Sr9b

2

Prelude*4/2/Marquis*6/Kenya 117A

Kenya 117A

Fetch, AAFC

 

Sr30

1+ to 2

Festiguay W2706 PI 330957

Festival / Uruguay C10837

Park, Australia

 

Sr17

;1

Prelude/8*Marquis*2/2/Esp 518/9

Esp 518/9

Fetch, AAFC

4

Sr9a

1- to 2-

ISr9a-Ra CI 14169

Red Egyptian/Chinese Spring

Jin, USDA

 

Sr9d

1- to 1

ISr9d-Ra CI 14177

Hope/Chinese Spring

Jin, USDA

 

Sr10

;1N to 3C

W2691Sr10 CI 17388

Marquis*4/Egypt NA95/2/2*W2691

Jin, USDA

 

SrTmp

2-

CnsSrTmp

Triumph 64 (CI 13679)/Chinese Spring

Jin, USDA

5

Sr24

1- to 2-

LcSr24Ag

Little Club/Agent (CI 13523)

Jin, USDA

 

Sr31

1- to 2

Kavkaz/Federation4

Kavkaz

Pretorius, SA

 

Sr38

X=

Trident

Spear*4/VPM (PI 519303)

Park, Australia

 

SrMcN

2-

McNair 701 (CI 15288)

 

Jin, USDA

 Source: Prof. Z.A. Pretorius, University of the Free State, South Africa