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20 0 1年 9月在湖南省 3个稻瘟病的主要发病县采集分离了 5 7个稻瘟病菌株 ,与法国国际农艺研究和发展中心提供的 4个标准菌株于稻谷粉琼脂培养基上对峙培养。结果表明 ,30 %和 12 %的测试菌株分别为交配型 1.1和交配型1 2 ,其余 6 0 %的测试菌株与 4个标准菌株中的任何一个均不能产生子囊果 ,即便是与田间新获得的两性菌株之间的对峙培养也不能产生子囊果。在所获 2 4个能育菌株中只有 5个为两性菌株 ,占 9%。各菌株在中国 7个鉴别品种上的测定共获 5群 2 0个小种 ,其中ZA和ZB为优势群 ,ZB15为优势小种。还就稻瘟病菌有性世代在田间存在与否进行了讨论。
In September 2001, 57 strains of Magnaporthe grisea were collected from three major blast-producing counties in Hunan Province and confronted with 4 standard strains provided by French International Agronomic Research and Development Center on rice-meal agar . The results showed that 30% and 12% of the tested strains were mating type 1.1 and mating type 1 2, respectively, and the remaining 60% of the tested strains and 4 of the 4 standard strains could not produce ascus, even with newly acquired The confrontation between the amphoteric strains can not produce ascus. Only 5 out of 24 fertile strains were amphoteric strains, accounting for 9%. A total of 20 races of 5 populations were obtained from each of the 7 tested cultivars in China. Among them, ZA and ZB were dominant and ZB15 was the dominant race. The existence of the sexual generation of M. grisea in the field was also discussed.