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以 P_1×P_2不完面双列杂交设计,分析了我国东北春玉米区优良自交系亚总体各数量性状的两种配合力及其变化和相互关系以及基本遗传参数。结果表明,所有数量性状的一般配合力(g·c·a)和特殊配合力(s·c·a)存在着一定差异,但大多数都不明显。s·c·a 的高低与其双新的 g·c·a 平均值没有直接关系,但具有高 s·c·a 的组合其中必有一亲的 g·c·a 高,而另一亲也不能太低。优良自交系各性状变异系数都较小,并且加性方差显著大于显性方差,说明其遗传基础狭窄。为了选出更好的自交系间杂种,迫切需要补充新的基因源。而现有的自交系可进行群体改良,在选择下将能产生较快的育种进展。
Based on the P_1 × P_2 incomplete double crosses design, the two combining ability, its variation, interrelation and basic genetic parameters of the quantitative traits of the elite inbred lines in northeastern China were analyzed. The results showed that there were some differences between the general combining ability (g · c · a) and the special combining ability (s · c · a) of all quantitative traits, but most of them were not obvious. The level of s · c · a is not directly related to the double new average value of g · c · a, but the combination of high s · c · a has a high g · c · a of one of the kin, and the other can not Too low The coefficient of variation of fine traits in elite inbred lines was small, and the additive variance was significantly greater than the dominant variance, indicating that the genetic basis of stenosis was narrow. In order to select better inbred lines, there is an urgent need to add new gene sources. However, existing inbred lines can be improved in groups, which will result in faster breeding progress.