Study on Division of Heterosis Group,Correlation and Path Analysis of Major Characters of Several Maize Germplasm

In this paper,24 materials including several different class group test-crossed,inbred lines,and US germplasm resources were used as tested materials,and the incomplete dialel cross design was employed to study heterotic patterns and correlation and path analysis experimental lines. The result showed that these 17 inbred lines were divided into 6 groups that consistent with the pedigree information using SCA of yield as distance in a diallel set of crosses between them based on the UPGEM method,SCA among goups was greater than that within groups. According to the correlative analysis,10 traits of ear length,ear diameter,seed length,seed set,kernel number per row,grain depth,single cob weight,ear weight,1000-kernel weight and ear yield rate were positively significant correlation with yield per plot,single cob diameter significantly correlated with plot yield. Path analysis showed that: the order of direct contribution of traits to yield and kernel weight per ear was ear weight seed set ear yield rate ear length grain depth 1000-kernel weight kernel number per row ear diameter single cob weight. Among them,the direct effects of ear weight,seed set,ear yield rate,ear length and grain deep on kernel weight per ear were positive effects,1000-kernel weight,kernel number per row,ear diameter and single cob weight were negative effects.