论文部分内容阅读
本文叙述了鉴别寄主的选择及小种鉴定的结果。按分离面对各品种的毒性频率顺序,以一定的梯度间隔选取鉴别寄主9个。小种编码用八进制。一般是编码小者毒性较弱,大者毒性较强,编码顺序即当前病菌群体毒性结构的大致体系。1984、1985年鉴定了18省、市、自治区249个标样,分出32个小种,在以鉴别寄主毒性频率划分的9个级别内,小种频率近于正态分布,以1-5群内小种频率高、分布广、占总数的79.2%,是抗病育种应予注意的小种群。四川、 北京两地白粉菌群体毒性结构相近,主要差异在菌量及各基因型小种的频率上。用3个鉴別寄主品种的相应毒性基因测试其在群体中的遗传结构,其基因频率及基固型频率分配呈连锁平衡。
This article describes the identification of host selection and racial identification results. According to the sequence of toxicity of different breeds, nine of them were identified by certain gradient intervals. Race encoding in octal. Generally encoding the lesser toxicity, greater toxicity of the larger, coding sequence that is the general system of the current bacterial population toxicity. In 1984 and 1985, 249 standard samples of 18 provinces, municipalities and autonomous regions were identified, and 32 races were identified. Within nine levels of identifying the virulence frequency of the host, the frequency of races was nearly normal, Small races in the frequency of high frequency, wide distribution, accounting for 79.2% of the total, is the breeding of breeding should pay attention to the small population. The virulence structures of powdery mildew in Sichuan and Beijing are similar, with the main differences being in the amount of bacteria and the frequency of each genotype races. The genetic structure of the three host strains was tested using the corresponding virulence genes of the three host cultivars, and the genetic frequency and the distribution of the base-fixed frequency were in a linkage equilibrium.