Race composition and genetic diversity of a Puccinia striiformis f. sp. tritici population from Yunnan and Guizhou epidemiological regions in China in 2018

Wheat stripe rust, caused by Puccinia striiformis f. sp. tritici (Pst), is an extremely destructive wheat disease worldwide. Yunnan and Guizhou provinces are the main overwintering regions for Pst inoculum sources in China. Surveillance of race dynamics population essential managing local other wheat-growing However, this region not monitored yearly. In study, a 113 isolates from 2018 were phenotyped on two differential sets analyzed 12 simple sequence repeat (SSR) markers. As result, 25 races identified Chinese differentials predominant was CYR32 with frequency 17.70%. None virulent to Yr5 Yr15. Only few showed virulence YrTr1 Zhong 4. The Kosman index (K) 0.292 differentials, 0.274 single Yr gene lines additional respectively. total, 64 MLGs detected among expected heterozygosity (He) 0.424. A close genetic relationship between Lufeng (Yunnan) / Nayong (Guizhou), Fuyuan Bijie Shizong Xingyi (Guizhou). This study provided useful information structure genes epidemiological regions, will be used guide control rust targeted breeding region.