玉米8个产量构成因素的通径分析

组配成不完全双列杂交的90个组合用3次重复的随机区组设计对玉米穗长等8个产量组成因素与子粒产量的关系进行了遗传相关和通径分析.结果表明穗长等8个性状与子粒产量的遗传相关系数均为正值.其中,结实性与子粒产量的遗传相关系数未达0.05的显著水平,千粒重与子粒产量的遗传相关系数达到0.05的显著水平,其余6个性状与子粒产量的遗传相关系数均达到了0.01的显著水平.通径分析结果表明,8个产量组成性状对子粒产量的相对重要性依次为结实长>穗粗>出籽率>千粒重>行粒数>穗行数>结实性>穗长.选育夏播高产杂交种时,要重视选择果穗结实长、果穗粗、出籽率高的类型。

The Path Analysis on Eight Characters of Componenting Yield of Maize

Ninety crosses were made for incomplete diallel crosses.Heridity correlation and heridity path of ear lenth etc eight characters of componenting yield with grain yield of maize were randonfized block design of three replications. The result indicated that heridity correlation coefficient of ear lenth etc eight characters of componenting yield with grain yield all were positive value.Among them,heridity correlation coefficient of bearing kernel with grain yield was nosignificant difference at P=0.05.Heridity correlection coefficient ofl000-kernel weight with grain yield was significant difference at P=O.05. Other heridity correlection coefficient of six characters with grain yield all were significant differences at P=0.01.The result of path analysis indicated that relatire inportance of eight characters of componenting yield with grain yield was lenth of bearing kernel>ear diamter>perent of bearing kernel>1000-kernel weight>kernel row number>kernel row number of ear>rate of bearing kernel>ear lenth.When selectiong high grain yield hybrid of summer planting,it must be paid attention to select types of lenth of bearing kernel,ear diamter and high rate ofproducting kernel.