【摘要】 分析了 2个稻瘟病田间采集菌株Y95 - 2 2 3和Y94 - 6 4的杂交后代的 5 4个菌株对合系 35号、楚粳 3号及日本鉴别品种新 2号、梅雨明、PiNo .4和K6 0共 11个水稻品种致病性测定结果。结果表明 :陆稻菌株Y94 - 6 4对合系35号、楚粳 3号、PiNo .4分别持有 2个无毒基因 ,对新 2号、K6 0分别持有一个无毒基因 ;菌株Y95 - 2 2 3对梅雨明持有一个无毒基因 ,因为Y95 - 2 2 3对梅雨明不致病 ,Y94 - 6 4对它致病 ,而杂交后代非致病菌株与致病菌株比为 1∶1.更多还原

【Abstract】 Segregation of pathogenic pattern of two field isolates and their 54 progenies of rice blast fungus, Magnaporthe grisea were analyzed on 11 rice cultivars. The results showed that the avirulence on Hexi 35, Cujing 3 and PiNo.4 as controlled by two avirulence genes derived from isolate Y94-64,and on rice varieties Shin2 and K60 were controlled by one avirulence gene derived from isolate Y94-64, respectively; and on rice varieties Tsuyuake was controlled by one avirulence gene derived from isolate Y95-223. Because parent isolate Y95-223 is avirulence to Tsuyuake, but isolate Y94-64 is virulence on Tsuyuake, and the segregation ratio of avirulence/virulence progenies was 1∶1.更多还原