2个玉米优势群体穗粒性状的密度效应分析

摘要

对Reid和非Reid 2个玉米优势群体在2种密度条件下6个穗粒性状的分析结果表明,各穗粒性状都是由多基因控制的复杂数量性状;高密度使除非Reid群体穗粗外的其余性状变劣,使非Reid群体的百粒重外的其余各性状的变异系数增大,高密度更有利于对性状实施表型选择,穗粒重和穗长更适宜作为穗粒性状耐密性的选择指标;Reid群体的耐密性优于非Reid群体;穗粒重同时由多个穗粒性状所决定,在利用Reid群体进行自交系选育过程中,更应注重协调各穗粒性状间的关系.%Six ear-kernel characters of two heterotic maize populations were analyzed under two planting densities. The results showed that ear-kernel characters were all complex quantitative traits in heredity. High planting density deteriorated all the characters, except ear diameter, and increased the variations of all characters, except 100-grain weight for the non-Reid population. High planting density was favorable for phenotypic selection of ear-kernel characters. Ear-kernel weight and ear length were the suitable selection criterion in planting density stress. Compared to non-Reid population, Reid population was less influenced by planting density. Ear-kernel weight was determined commonly by all ear-kernel characters. Great attention should be paid on coordinating the relations among different ear-kernel characters during the inbred line development from Reid population.