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United States Department of Agriculture

Agricultural Research Service

Race identification
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Development of Differential Varieties - A Review

Nomenclature Systems and Differential Lines

Infection types (images)

Wheat stem rust

  • Wheat leaf rust
  • Oat crown rust
  • Oat stem rust



* Updated Pgt code for 20 differential hosts for Puccinia graminis f.sp. tritici in ordered sets of four1.


 Infection type produced on near isogenic Sr Lines3


Host set 1

5

21

9e

7b

Host set 2

11

6

8a

9g

Host set 3

36

9b

30

17 (+13)

Host set 4

9a

9d

10

Tmp

Race code2

Host set 5

24

31

38

McN


B

L

L

L

L

C

L

L

L

H

D

L

L

H

L

F

L

L

H

H

G

L

H

L

L

H

L

H

L

H

J

L

H

H

L

K

L

H

H

H

L

H

L

L

L

M

H

L

L

H

N

H

L

H

L

P

H

L

H

H

Q

H

H

L

L

R

H

H

L

H

S

H

H

H

L

T

H

H

H

H


1 See Plant Disease 92:923-926.

2 Pgt Code consists of the designations for subset 1 followed by that for subset 2, etc. For example, TTTTT is virulent (high infection type) on all 20 differential hosts and race DCLBB is virulent on differential hosts with Sr9e, 9g, and 36. Low and high infection types indicate an incompatible and a compatible host-pathogen interaction, respectively.

3 L = low infection type (avirulent pathogen); H = high infection type (virulent pathogen).




** Updated code for North American differential hosts for Puccinia triticina in ordered sets of four.


 Infection type produced on near isogenic Lr Lines2


Host set 1

1

2a

2c

3

Host set 2

9

16

24

26

Host set 3

3ka

11

17

30

Host set 4

B

10

14a

18

Race code1

Host set 5

21

28

41

42


B

L

L

L

L

C

L

L

L

H

D

L

L

H

L

F

L

L

H

H

G

L

H

L

L

H

L

H

L

H

J

L

H

H

L

K

L

H

H

H

L

H

L

L

L

M

H

L

L

H

N

H

L

H

L

P

H

L

H

H

Q

H

H

L

L

R

H

H

L

H

S

H

H

H

L

T

H

H

H

H


1 Prt code consists of the designation for set 1 followed by that for set 2, etc. For example, race MGB: set 1 (M) - virulent to Lr1,3; set 2 (G) - virulent to Lr16; set 3 (B) - avirulent (see Phytopathology 79:525-529).

2 L = low infection type (avirulent pathogen); H = high infection type (virulent pathogen).


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Last Modified: 12/16/2014
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