摘要： 从我国玉米品种资源中首次成功筛选出9个具有广泛血缘代表性的自交系，即沈137，78599-1，Mo17，478，C8605-2，E28，598，Va35，K12，作为玉米灰斑病菌的生理分化鉴别寄主；8个主栽品种，即沈试29，沈试31，铁单9，掖单13，丹413，丹玉18，沈农87，东单54，作为辅助鉴别寄主，从而确定了玉米灰斑病菌生理分化鉴别寄主体系。采用田间成株期鉴定，高粱粒灌心法进行接种，根据在鉴别寄主上的发病等级，将采自北方玉米主产区的23个玉米灰斑病菌菌株划分成5个致病类型。研究表明，我国玉米灰斑病菌存在一定程度的致病性分化，通过病级评价可将23个玉米灰斑病菌菌株分成5个致病类型，其中致病类型I为强致病类型，致病类型IV为弱致病类型，Ⅱ，Ⅲ2组致病类型介于两者之间，而致病类型V属于不确定类型。研究结果为我国玉米品种抗性鉴定、灰斑病流行监测和品种合理布局提供了理论依据。

关键词: 玉米灰斑病菌, 致病性分化, 鉴别寄主

Abstract: A set of maize inbreds or cultivars were firstly screened as GLS(Cercospora zeae-maydis)pathogen differential hosts with genetic background which current cultivars shared in China,such as inbreds Shen137,78599-1,Mo17,748,C8605-2,E28,598,Va35,K12 were identified as major ones,and cultivars Shenshi29,Shenshi31,Tiedan9,Yedan13,Dan413,Danyu18,Shennong87,Dongdan54 as affiliated ones.In term of disease rank on differential host,23 GLS strains could be classified into 5 pathogenecity groups through identification at adult stage.The pathogen-grown sorghum grains were used for inoculation into plant whirl.Among pathogenecity types we detected,the pathogenicity typeⅠappeared to be highest virulence to host plants,and pathogenicity type Ⅳ is weak one,pathogenicity types Ⅱ,Ⅲ were in middle place.The pathogenicity type V so far seemed to be difficult to be evaluated in pathogenecity.The result mentioned above provided a sound basis for breeding and identifying resistant cultivars,scientifically planting resistant cultivars in growing areas as well as monitoring of pathogen differentiation.

Key words: Gray leaf spot pathogen, Pathogenic differentiation, Differential host

中图分类号: 

• S435.13