本研究选用9个自交系材料作为玉米灰斑病致病性分化的鉴别寄主,对采自吉林省不同地区的14个菌株进行致病性分化研究。结果发现不同菌株侵染寄主病斑表现不同的反应型；不同菌株间致病力存在差异；根据在鉴别寄主上的发病等级可将吉林省玉米灰斑病菌菌株分为五个致病类群,其中Ⅰ为强致病类型,Ⅱ、Ⅲ为中等致病类群,Ⅳ、Ⅴ为弱致病类群,表明玉米灰斑病菌存在明显的致病分化现象。研究结果为我省玉米种植品种的合理布局和抗病育种工作提供了一定的理论基础。
英文摘要:
14 isolates of Cercospora zeay-maydis, mainly isolated from corn gray leaf spot in different geographic regions in Jilin province, which were characterized by 9 differential host. The results showed that the progress levels of symptom were different after the different C. zeae-maydis infection. The type of host reaction has polymorphism. The aggressivity was different between every isolates. Fourteen isolates were classified into five pathogenicity groups by the different aggressivity.Ⅰwas the highest virulence to host, Ⅱand Ⅲ were the middles,Ⅴand Ⅳwere the weakest. The results showed that the pathogenicity of corn gray leaf spot was differentiate obviously and provided a basis for scientifically planting resistant cultivars in growing areas and breeding resistant cultivars.
;
