中国部分地区马铃薯晚疫病菌生理小种的组成及分布

 利用 8个分别含有单显性基因R1、R3、R4、R6、R7、R9、R10、R11及其不同组合的复合基因鉴别寄主 ,对1997～ 1998年采自河北、云南、四川、重庆和内蒙古等地的 90个马铃薯晚疫病菌菌株进行了生理小种测定。结果表明 ,90个菌株中有 2 1个生理小种。发生最普遍的小种为 1.3.4 .7.9.10 .11,发生频率为 32 .2 % ;其次较普遍的小种还有 1.3.4 .6 .7.9.10 .11和 3.4 .7.9.11,发生频率均为 10 .0 %。参加测试的抗性基因全部都能被被测菌株的毒力基因克服 ,说明被测晚疫病菌群体中的毒力基因存在非常普遍

Component Structure and Distribution of Race of Phytophthora infestans in the Investigated Areas of China

Ninety isolates collected from 5 different provinces and cities (Hebei, Yunnan, Sichuan, Chongqing, Inner Mongolia ) were tested with 8 dominant mono genes R1,R3,R4,R6,R7,R9,R10,R11 and their multi genes potato clones of the international late blight differential host. It was concluded that (1) in the 90 isolates tested there are 21 different races of 1.3.4.7.9.10.11 in most cases with frequency of 32.2%, followed by 1.3.4.6.7.9.10.11 and 3.4.7.9.11 with frequency of 10.0%, (2) all tested resistant genes were compatible to the virulent gene of isolates of Phytophthora infestans assayed, which indicated that the virulent genes were very common in the tested population of Phytophthora infestans.