不同产量水平的玉米自交系农艺性状分析

Agronomic Traits Analysis on Maize Inbred Lines with Different Yield

采用聚类分析、因子分析、通径分析的方法,对我国常用自交系的农艺性状与单株产量间的关系进行分析。研究影响我国玉米自交系单株产量的主要因子,了解不同产量水平下自交系农艺性状间的关系。结果表明,我国常用66份自交系划分为低产型和高产型两类。不同玉米自交系性状间存在很大差异,同一自交系不同性状间也存在差异,同时筛选出具有不同优良性状的自交系。按方差贡献率大小,对玉米自交系单株产量起重要作用的主因子依次为衰老、叶源量、生物学产量、穗生长势等。千粒重对低产自交系起主要决定作用,行粒数是高产自交系的主要决定因素,穗行数是其主要限制因素。改良自交系应注重主因子的效应,低产自交系主攻千粒重,高产自交系主攻行粒数。

Using clustering analysis, factor analysis and path analysis, the relations between agronomy trait and yield per plant were investigated. The main components influencing maize yield were analyzed, the relations among agronomy traits and the improvement measure under different yield treatment were also discussed. The result showed that 66 inbred lines in common use were ploted out 2 species, low-yield type(LY) and high-yield type(HY). The difference of traits among inbred lines were obvious, which also exist...