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为分析相同遗传背景下稻瘟病菌致病性变化情况,利用24个水稻单基因系品种为评价体系,通过喷雾接种的方式,对36个以空育163为哺育品种的稻瘟病菌株进行了分析,得出以下结论:1、供试菌株致病力强,对24个抗瘟基因的致病率在36.11%~100%之间,平均致病率77.51%,逐年增强趋势明显。2、供试菌株致病性分化严重,相似系数在0.00~1.00之间,在相似系数0.50水平上,共划分为29个类群,优势类群菌株占总菌株的13.89%。3、24个抗瘟基因对供试菌株抗谱在5.56%~56.48%之间,Pi-km抗谱最窄,Pi-9(t)抗谱最宽;在基因搭配前提下,Pi-9(t)&Pi-12(t)组合和Pi-9(t)&Pi-11组合效果略好。总体分析,供试菌株致病力和致病性分化都处于较高水平,目前缺少高效抗源加以控制。
In order to analyze the pathogenicity changes of Magnaporthe grisea in the same genetic background, 36 rice blast isolates were obtained by spray inoculation using 24 single-line rice cultivars The conclusions are as follows: 1. The pathogenicity of the tested strains was strong, the pathogenicity of the 24 anti-blast genes was between 36.11% and 100%, the average incidence rate was 77.51%, which showed an obvious trend of increasing year by year. The pathogenicity of the tested isolates was serious. The similarity coefficients were between 0.00 and 1.00. On the similarity coefficient of 0.50, they were divided into 29 groups, and the predominant strains accounted for 13.89% of the total strains. The resistance spectra of 3 and 24 anti-blast genes were between 5.56% and 56.48%, the narrowest Pi-km spectrum and the widest spectrum of Pi-9 (t) (t) & Pi-12 (t) and Pi-9 (t) & Pi-11 combined slightly better. Overall, pathogenicity and pathogenicity of the tested strains were all at a high level, and the current lack of efficient anti-source control.