我国稻瘟病菌毒力基因的组成及其地理分布

用我国育成的6个近等基因系和IRRI-日本合作育成的24个单基因系,对来自我国吉林、辽宁、河北、江苏、浙江、四川、湖南、福建、广东和云南10个省的322个稻瘟病单孢菌株的毒力基因组成及其地理分布进行了测定和分析.结果表明,我国稻瘟病菌株含有与所有测试抗病基因相应的毒力基因,其中Av-kh+、Av-z+、Av-z5+和Av-9(t)+的出现频

Virulence Genes Diversity and Geographic Distribution of Pyricularia grisea in China

Three hundred and twenty-two rice blast isolates were collected from Jilin, Liaoning, Hebei, Jiangsu, Zhejiang, Sichuan, Hunan, Fujian, Guangdong and Yunnan provinces in China. The virulence genes diversity and geographic distribution were tested with 6 near-isogenic lines (NILs) of China and 24 monogenic lines of IRRI-Japan. The results showed that all the virulence genes, which corresponding to the resistance genes in the NILs and monogenic lines, were detected in China. The occurrence frequency of Av-k h , Av-z , Av-z 5 and Av-9(t) were below 20% and that of Av-a(1) , Av-a(2) , Av-i , Av-7(t) , Av-3 , Av-b , Av-k p , Av-k s(1) , Av-k s(2) , Av-ta(1) , Av-ta(2) , Av-t , Av-sh(1) , Av-sh(2) , Av-19(t) and Av-k m were all above 50%. Av-9(t) had not been detected in Jilin, Zhejiang, Sichuan, Guangdong and Yunnan provinces. Av-k h had not been detected in Sichuan, Guangdong and Yunnan provinces. Av-z had not been detected in Fujian province. Av-z 5 and Av-z t had not been detected in Zhejiang province. The other 25 virulence genes had been detected in all the 10 regions. The occurrence frequency of virulence genes in indica and japonica rice growing regions had no correlativity with the type of donor parents of the corresponding resistance genes.