| In order to understand the population structure of P. striiformis f.sp. tritici race in Tibet, 130 of wheat stripe rust were identified and analyzed in Tibet in 2011. Results showed that the population structure of P. striiformis f.sp. tritici race in Tibet was complicated. A total of 26 races(pathotypes) were detected, including CYR17,CYR18,CYR19,CYR20,CYR26,Lov10 2,Lov10 3,Lov10 14,Lov10 15,Lov13 4,CYR31,CYR32,HY 6,HY 13,CYR33,Su11 1,Su11 2,Su11 3,Su11 4,Su11 5,Su11 6,Su11 8,Su11 10,Su11 25,Su11 35,Su11 45. The first dominant race was CYR32 and its frequency was 31.54%; the second was CYR33 and its frequency was 28.46%;basically, Su11 1 and Su11 4 have same frequency were 6.15%. They were dominative races in Tibet and were the main object for resistance breeding to wheat stripe rust. The frequency of other races (pathotypes) was lower 5%. The cultivars carrying genes Yr1,Yr3,Yr6,Yr9,YrA had become susceptible to the prevalent races. |
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