【摘要】 水稻白叶枯病病菌的致病性分化,可按寄主—病原相互作用所表现的抗感反应来区分。我们于1979—1982年用浙江各地菌株在国内和日本鉴别品种上进行了试验。在国内6个鉴别品种上测试表明,存在分化性与专化性两类分化,各占62.89％和37.11％,包括Ⅰ(强)、Ⅱ(中)、Ⅲ(弱)和Ⅳ(极弱)4个致病群,分别为18.22％、41.52％、35.73％和4.53％。菌株—品种间有特异性(互作达到显著水平);国内或日本鉴别品种对菌株的抗感反应,除连续性数量性状外,还存在非连续性质量性伏,说明白叶枯病菌有明显生理分化的病原小种。我国与日本鉴别品种系统有差异,如日本无抗性基因品种金南风,对日本所有的菌系群(Ⅰ—Ⅴ)感染,而对我国菌株表现中度抵抗;金锁群的特特普对日本菌系Ⅰ和Ⅱ群抵抗,而对浙江所有的菌株感染。更多还原

【Abstract】 The differentiation of pathogenicity of Xanthomonas campestris pv.oryzae can be distinguished by the reaction of resistance or susceptibility in host-pathogen interaction. The present study has been carried out in Chinese andJapanese differential rice varieties inoculated with the isolates from various places of Zhejiang Province on the 6 Chinese differential varieties. The expression of interaction was classified into two kinds , the specialized(37.11%), and the differentiated ( 62.89% ), both consisting of 4 pathogenic groups: Ⅰ(18.22%), Ⅱ (41.52%), Ⅲ (35.73%)and Ⅳ (4.53%). Analysis of variance of the different variety-isolate combinations showed significant or highly significant interactions, suggesting that the pathogenic reaction of the blight bacteria may not only be of a continuous quantitative character, but also of a discontinuous, qualitative one. Therefore physiological races with distinct specializations existed in the bacterial pathogens. The results might explain the variation in the host-pathogen relationship. The Chinese and Japanese differential varieties were differentiated in resistance,as the cultivar Kinmaze was susceptible to the Japanese groups(Ⅰ-Ⅴ), but moderately resi stant to the Chinese isolates, whereas the cultivar Te-tep was resistant to Japanese groups Ⅰ and Ⅱ , but susceptible to all the Zhejiang isolates.更多还原