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根据传统应用的生理小种研究方法存在着因鉴别品数的不同及其数目的改变而引起小种命名的混乱;同小种不同菌株致病性不同及有限的鉴别寄主不能及时区分出危险性小种等问题,本文改用病菌群体对品种的毒力频率和联合致病性方法,用河南各地的90个小麦白粉菌株分别接种9个已知抗性基因的品系和8个推广或区试品种所得到的侵染型资料,分别计算菌株群体对各对品种的联合致病性系数和联合毒性系数.结果表明本省小麦白粉菌群体中的V_1和V_(3c)、V_1和V_5及V_3b和V_3C等毒性基因是联合的;花培28和周80—48及周80—48和郑州831等品种组合搭配种植可有效地控制小麦白粉病.因此这套方法对生产和抗病育种的作用是直接的.文中提出应根据研究对象和研究目的不同,选择适当的研究方法,以提高病原物致病性研究结果的有用性.
According to the traditional application of races, there are some racial chaotic races due to the differences in the number of identifications and the number of races. The pathogenicity of the races with different races and their limited host can not distinguish the small In this paper, the virulence frequency and the combination pathogenicity of the pathogen population were used in this study. Ninety-nine resistant wheat lines were inoculated with 90 wheat powdery mildew strains and eight varieties The results showed that V_1 and V_ (3c), V_1 and V_5, V_3b and V_3C in the powdery mildew of the province And other virulence genes are combined; flower cultivation 28 and weeks 80-48 and weeks 80-48 and Zhengzhou 831 and other varieties combinations with planting can effectively control wheat powdery mildew. Therefore, this method of production and resistance breeding is direct It is suggested that the appropriate research methods should be selected according to the different research objects and research purposes so as to improve the usefulness of the pathogenicity research results.