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Wheat stripe rust is a severe threat of almost all wheat-growing regions in the world. Being an obligate biotrophic fungus, Puccinia  striiformis f. sp. tritici ( PST ) produces new virulent races that break the resistance of wheat varieties. In this study, 115 progeny isolates were generated through sexual reproduction on susceptible Himalayan Berberis  pseudumbellata using a dominant Pakistani race (574232) of PST . The parental isolate and progeny isolates were characterized using 24 wheat Yr single-gene lines and ten simple sequence repeat (SSR) markers. From the one-hundred-and-fifteen progeny isolates, 25 virulence phenotypes (VPs) and 60 multilocus genotypes were identified. The parental and all progeny isolates were avirulent to Yr5 , Yr10 , Yr15 , Yr24 , Yr32 , Yr32 , YrSp , YrTr1 , YrExp2 , Yr26 , and YrTye and virulent to Yr1 , Yr2 , Yr6 , Yr7 , Yr8 , Yr9 , Yr17 , Yr25 , Yr27 , Yr28 , YrA , Yr44 , and Yr3 . Based on the avirulence/virulence phenotypes, we found that VPs virulent to Yr1 , Yr2 , Yr9 , Yr17 , Yr47 , and YrA were controlled by one dominant gene; those to YrSp , YrTr1 , and Yr10 by two dominant genes; and those to YrExp2 by two complementary dominant genes. The results are useful in breeding stripe rust-resistant wheat varieties and understanding virulence diversity.

Study of Inheritance and Linkage of Virulence Genes in a Selfing Population of a Pakistani Dominant Race of Puccinia striiformis f. sp. tritici