2011年西藏地区小麦条锈菌生理小种群体结构分析

Population Structure and Analysis of Puccinia striiformis f.sp.tritici Race in Tibet in 2011

为了解西藏地区小麦条锈菌生理小种群体结构,2011年对采自西藏地区的130份小麦条锈菌标样进行鉴定并进行了群体结构分析。结果表明,西藏地区小麦条锈菌群体结构复杂,小种类型丰富;共监测到26个小种(类型),分别是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。其中,CYR32频率最高,达到31.54%;其次为CYR33,频率为28.46%;跟随其后的Su11-1和Su11-4频率均为6.15%。这4个小种为西藏地区优势小种,是当前西藏地区抗条锈病育种的主要考虑对象。其他小种(类型)频率均低于5%。毒力频率分析表明,Yr1、Yr3、Yr6、Yr9、YrA等抗性基因在西藏地区已经失效。

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.