中南4省水稻细菌性条斑病菌致病型的比较

Comparison of the Pathogenicity of Xanthomonas oryzae pv. oryzicola Causing Streak Blight of Rice in Four Provinces in Central South China

以金刚 30、窄叶青、XM 5、XM 6、M4 1等 5个品种为鉴别品种 ,将来自 4省的 75个细条病菌菌株的毒力划分为 0、Ⅰ、Ⅱ、Ⅲ、Ⅳ、Ⅴ、Ⅵ等 7个致病型 ,0、Ⅰ、Ⅱ、Ⅲ、Ⅳ型毒力差异主要呈由弱到强的数量变化 ,占测试株的 89.3% ,其中较强毒力的Ⅲ、Ⅳ型菌占参试菌的 5 4 .7% ;Ⅴ和Ⅵ型间呈交叉反应式的强互作关系 ,占参试菌的 10 .7%。 4省菌株毒力的比较表明 ,福建省以Ⅲ、Ⅳ型菌为主 ;江西省以Ⅲ、Ⅵ型菌为主 ;湖北省以Ⅱ、Ⅲ型菌为主 ;湖南省没表现突出的优势群 ,但较强毒力的Ⅱ、Ⅲ、Ⅳ型菌所占比例为 5 5 .6 %。

The pathogenicity of 75 isolates from Rice Streak Bligh t caused by Xanthomonas oryzae pv.oryzicola (Xoo) from the provinces of Hubei, Hunan, Jiangxi, Fujian was tested on 5 differential varieties of Jingang3 0,Zheyeqing, Xm5, Xm6 and M41 . It was classified into seven pathotypes of 0,Ⅰ ,Ⅱ,Ⅲ,Ⅳ,Ⅴ,Ⅵ. 89.3% of them was belong to pathotypes of 0,Ⅰ,Ⅱ,Ⅲ, Ⅳ, whoes virulence represented as quantity variation from weak to strong.The pa thotypes of Ⅲ and Ⅳ were suggested to be targets of breeding for disease re sistance as they showed much higher virulence and proportion(54.7%) . It was 10 .7% the proportion of strain Ⅴ and Ⅵ that showed quality variation with cross interaction. A high attention should be paid for monitoring them.The result ind icated that the predominant pathotype was Ⅲand Ⅳ in Fujian,Ⅲand Ⅵ in Jianxi, Ⅱand Ⅲ in Hubei, no predominant in Hunan. But the sum of proportion ofⅡ,Ⅲ,Ⅳ was 55.6% comparing with the virulence of Xoo from four provinces.