Octal System


Octal system for identifying races of Puccinia striiformis f. sp. tritici
Yr gene set Yr gene Code Reaction
1 1 5 6 0 A A A
2 7 8 9 1 V A A
3 10 15 17 2 A V A
4 24 27 32 3 A A V
5 43 44 SP 4 V V A
6 Tr1 Exp2 Tye 5 V A V
6 A V V
7 V V V
Races of Puccinia striiformis f. sp. tritici are identified using the virulence (V)/ avirulence (A) reactions of an isolate across the Yr single-gene line set of wheat differentials.

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