10个玉米自交系穗部性状的配合力和遗传参数分析

Combining Ability and Genetic Parameters of Ear Characters of Ten Maize Inbred Lines

以丹东农业科学院利用单倍体诱导方法育成的7个玉米自交系为母本、3个骨干系为父本,按P_1×P_2不完全双列杂交设计,用NCⅡ分析方法,对8个穗部性状的配合力及其群体遗传参数进行研究。配合力分析结果表明:自交系K6、X69、X18和XLL多个性状的一般配合力高,可直接利用。XLL×K6和X69×K6组合具有较强的杂种优势,有较大的增产潜力。通过对遗传参数的分析,对穗长、穗行数、行粒数、百粒重和出子率宜进行早代选择,而对产量性状、穗粗和秃尖长宜早晚代相结合进行选择。

Seven new female maize inbred lines were tested with the design of P1×P2 incomplete diallel crossing of NC Ⅱ method to study on combining ability and genetic parameters of ear characters. The results showed that the lines of K6, X69, X18 and XLL had higher common combining ability, which could be used directly. The combinations of XLL×K6 and X69×K6 with stronger heterosis had potential in increasing yield. Based on the analysis of genetic parameters, ear length, ear rows, row grains, 100-kernel weight, and percentage of kernel weight in ear weight should be selected earlier, and yield, ear diameter and bald should be selected earlier or later according to situation.