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. Under the conditions of certain ecological and cultural conditions, the optimal branch type, the length of ear, the number of ears per ear, the grain weight per thousand, and the seed yield of single hybrid corn were studied by means of stepwise regression, genetic correlation and path analysis. The direct and indirect effects of grain weight were studied.The results showed that the direct effect of row grain number and 1000-grain weight and the indirect effect of ear length through row grain number had a relatively high degree of relative importance to individual grain weight, It is preliminarily believed that the three traits as the selection index, direct selection, and coordination between grain weight and grain weight, the relationship between grain number is expected to choose a higher yield of single grain hybrids.