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用江苏省的吴江、赣榆、通州、高邮和宜兴等5个代表地区的324个稻瘟病菌株接种13个日本已知抗病基因品种。结果表明,江苏省稻瘟病菌对携带有Pi-K~s、Pi-ta、Pi-ta~2和Pi-sh抗病基因品种的可致病比例较高,毒力频率达64.2％～97.2％;对携带有Pi-i、Pi-z~t和Pi-b抗病基因的品种毒力频率较低,在0～11.9％之间;江苏省稻瘟病菌毒性的群体结构年度间有一定变化,表现为对某些抗病基因品种毒力频率的明显上升或下降。从江苏省10个主栽品种上分离的稻瘟病菌株对13个已知抗病基因品种的毒力频率测定结果表明,不同类型主栽品种上分离的菌株其毒性结构组成有一定差异,表明江苏省水稻主栽品种的抗性类型存在一定差异。
Thirteen Japanese known disease-resistant gene cultivars were inoculated with 324 M. grisea strains in five representative areas of Wujiang, Ganyu, Tongzhou, Gaoyou and Yixing in Jiangsu Province. The results showed that the rate of pathogenicity of Pyricularia grisea in Jiangsu Province carrying Pi-K ~ s, Pi-ta, Pi-ta ~ 2 and Pi-sh resistance genes was high, and the virulence frequency was between 64.2% ~ 97.2 %. The frequency of the virulence genes carrying Pi-i, Pi-z-t and Pi-b genes was relatively low, ranging from 0 to 11.9%. The population structure of Magnaporthe grisea Change, manifested as a significant increase or decrease of the virulence frequency of certain disease-resistant gene varieties. The virulent frequency of 13 strains of M. grisea isolated from 10 main cultivars in Jiangsu Province showed that the strains isolated from different varieties had some differences in their virulence structures, There are some differences in the types of resistance among the main rice varieties in the province.