【摘要】 在 13个已知日本抗病基因品种上检测 1997～ 1999年采集自江苏省吴江、赣榆、通州、高邮和宜兴等 5个代表地区的 32 4个稻瘟病菌株的毒性 ,结果可将上述菌株划分为 90种毒性类型 ,表明江苏省稻瘟病菌存在着丰富的毒性多样性。毒性类型组成在地区间存在较大的差异 ,并且随着时间的推移 ,稻瘟病菌毒性类型组成有差异加大的趋势。在已知抗病基因品种上测定江苏省稻瘟病菌的毒力 ,结果显示 ,Pi ks、Pi ta、Pi ta2 和Pi sh等抗病基因对江苏省的稻瘟病菌的抗谱很窄 ,而Pi i、Pi z、Pi zt 和Pi b等抗病基因的抗谱比较宽 ,可作为抗源加以利用。用 6个代表性毒性类型菌株接种江苏省 80个水稻主栽品种和新育成品种 ,品种抗性分析表明 ,上述水稻品种中的籼稻和杂交稻对江苏省稻瘟病菌具有较高的抗性 ,而粳稻品种的抗性较差。上述研究结果为利用水稻品种抗性多样性控制稻瘟病提供了依据更多还原

【Abstract】 Three hundred and twenty four isolates were obtained from rice blast specimens collected from five typical areas-Wujiang, Ganyu, Tongzhou, Gaoyou and Yixing in Jiangsu Province during 1997～1999. The isolates were assessed against 13 Japanese cultivars for which resistance genes have been determined and were divided into 90 pathotypes. This indicated that complex virulence diversity exists in Magnaporthe grisea in Jiangsu Province. The pathotype composition were dissimilar in the five typical areas, and from 1997～1999, the dissimilarity tended to increase. The analysis of virulence frequency indicated that the resistance genes Pi k s, Pi ta, Pi ta 2 and Pi sh had narrow resistance spectra to Magnaporthe grisea isolates tested in Jiangsu Province, while the genes Pi i, Pi z, Pi z t and Pi b had wide resistance spectra to the pathogen and had value in rice breeding as resources of resistance. Inoculation with six strains that represent six typical pathotypes of Magnaporthe grisea on 80 major cultivars and newly bred cultivars of Jiangsu Province showed that most of the Indica cultivars and hybrid rice cultivars tested were resistant and the Japonica rice cultivars were susceptible to the pathogen. The results provide a basis for use of resistance diversity of rice cultivars to control rice blast.更多还原