摘要： 利用逐步回归、遗传相关、通径分析的统计方法，研究玉米理想株型杂交种，在一定的生态和栽培条件下，雄穗分枝，果穗长、穗行数、千粒重、出籽率对单株粒重的直接和间接效应。结果表明：行粒数、千粒重的直接作用与果穗长通过行粒数的间接作用，对单株粒重的相对决定程度都较高，在影响单株粒重诸因素中占主导地位。初步认为以这三个性状作为选择指标，直接选择，并协调好千粒重与行粒数的关系，可望选出单株籽粒产量较高的杂交种。

关键词: 玉米, 遗传相关, 通径分析, 决定系数

Abstract: Ideal plant type of hybrid in maize was studied by use of stepwise regression,genetic correlation and path analysis.Seven characters such as branchs of tassel,length of ear,ear rows,seed number of row,1000 weight,shelling percentage and grain yield per plant were tested under gaven ccologic and cultural condition.The results suggest that the yield per plant was determined relatively by the direct effect of number of ear row and 1000 weight and the indirect effect of ear length through,seed number of row.And considered that these 3 characters might be used as select index,because they were the main factors which influence the grain yield.The high yielding hybrid could beselected by select these 3 characters directly and compromise the relationship of 1000 kernel weight and seed number of ear row.

Key words: Maize genetic correlation, Path analysis, Determinate coefficient