【摘要】 在1975—1979年间,先后测定全国各地258个水稻白叶枯病细菌菌株的致病力差异,供试用的鉴别品种包括国内外抗性强弱不等的水稻品种32个。测定结果表明,我国水稻白叶枯病细菌不同菌株的致病力有明显差异。根据最后选出的IR26、南粳15、金南风、江宁糯和金刚30五个品种的反应,可以将测定的菌株分为四个致病力强弱不等的菌系群(Ⅰ—Ⅳ)。孕穗期和苗期接种的结果有一定的相关性,但是孕穗期测定的结果较为稳定,无论是菌株致病力或品种抗病性的测定,以孕穗期剑叶接种的结果更为可靠。从测试的菌株和水稻品种来看,还未发现菌株与品种之间有特异性的反应,但这还有待进一步的研究。更多还原

【Abstract】 During 1975—1979, the pathogenicity of 258 isolates of the rice bacterial leaf blight organism(Xanthomonas oryzae)collected from different parts of China were tested. 32 rice varieties with different degrees of resistance were used in the test. Among them, five were selected as differentials, namely, IR-26, Nan Geng 15, Kinmaze, Jiang Ning Nuo and Jin Gang 30. Four strain groups (Ⅰ, Ⅱ,Ⅲ and Ⅳ )differing in virulence were identified according to their different grades of infection on these differentials. Tests were made by inoculating the seedlings at the four-leaf stage as well as the flag leaves of the matured plants,and the reaction was more stable and reliable in the latter case.According to the reactions of the isolates so far tested,no specificity in reaction was found between the strains of the causal organism and the rice varieties.更多还原