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本试验用两个亲本估算环境方差的方法,测定玉米小斑病菌(Cohliobolus holerpstro-phus)7×30号菌株和7×297号菌株两个杂交组合在玉米杂交种“中单2号”幼苗上引起的病斑大小和产孢能力(L—产孢量)、培养滤液内的致病毒素对玉米幼苗根生长的抑制作用(毒素抑制作用)以及在 PDA 平面上的产孢能力(P—产孢量)等四个数量性状的广义遗传力,并对性状的相关性、非等位基因间互作和有效因子数(K 单位)作初步估算。遗传力估算结果,病斑大小是11.19—17.08%,L—产孢量是52.49—75.45%,毒素抑制作用是66.53—83.53%,P—产孢量是52.3—56.96%。性状的有效因子估计值分别是:病斑大小26.2—45.9,L—产孢量3.5—9.4,毒素抑制作用6.5—11.4,P—产孢量是7.5—10.8。控制 L—产孢量的基因没有显著的上位性效应,控制毒素抑制作用的基因有显著的上位性效应。病斑大小和毒素抑制作用之间、病斑大小和 L—产孢量之间以及 P—产孢量和L—产孢量之间没有显著的相关性。
In this experiment, two crosses of Cohliobolus holerpstro-phus strain 7 × 30 and strain No. 7 × 297 were tested on the “Zhongdan No.2” seedling of a maize hybrid using two methods for estimating the variance of the environment. Induced lesion size and sporulation (L-sporulation), inhibition of pathogenic virulence in culture filtrate on root growth of maize seedlings (toxin inhibition), and sporulation on the PDA plane (P- The amount of spores) and other four quantitative traits of the generalized heritability, and the correlation of traits, non-allelic interactions and the number of effective factors (K units) as a preliminary estimate. Heritability estimates showed that the lesion size was 11.19-17.08%, the L-sporulation rate was 52.49-75.45%, the toxin inhibitory effect was 66.53-83.53%, and the P-sporulation rate was 52.3-56.96%. Effective estimates of traits were: lesion size 26.2-45.9, L-sporulation 3.5-9.4, toxin inhibition 6.5-11.4, P-sporulation 7.5-10.8. Genes controlling L-sporulation did not have significant epistatic effects, and genes that control toxin inhibition had a significant epistatic effect. There was no significant correlation between lesion size and toxin inhibition, lesion size and L-sporulation, and P-sporulation and L-sporulation.