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本文用双列杂交试验资料分析了玉米自交系的两种配合力在 F_1代的表现:杂种优势取决于双亲的配合力总效应;特殊配合力效应(?)与 F_1的相关性比一般配合力效应(?)更为密切;(?)是直接形成杂种优势的主要原因。杂交组合的两种配合力间呈中等程度的正相关;配合力变化时,(?)的变化远大于(?)均,(?)与高(?)间有更密切的正相关。(?)与特殊配合力水平((?))两者是完全一致的;随着(?)的变化,(?)的变化几乎大一倍。作者认为:玉米育种要着重培育配合力高的自交系,关键是 g.c.a.高;用广谱测验种筛选 g.c.a.和用自交系测验种改良 g.c.a,均有较高的效率;配合力类型是选择亲本配合力的适宜指标,优良的配合力类型有四种;高产的配合力组合是:双亲的(?)≥中,至少一亲为高(?),双亲的(?)的平均值为中。
In this paper, we analyzed the combining ability of two inbred lines of maize inbred lines in F1 generation by using the double-line hybridization test data. The heterosis depends on the total effect of parents’ combining ability. The special combining ability effect (?) Has a higher correlation with F_1 Force effect (?) Is more closely; (?) Is the main reason for the formation of heterosis. There was a moderate degree of positive correlation between the two combining ability of hybrid combinations. The variation of (?) Was significantly greater than that of (?) When the combining ability was changed, and there was more positive correlation between (?) And (?). (?) And the level of special combining ability ((?)) Are exactly the same; as (?) Changes, the change of (?) Is almost doubled. The author thinks that the key point of gca breeding is to cultivate inbred lines with high combining ability, and the gca should be the key. The selection of gca with broad-spectrum test and gca with inbred lines should have higher efficiency. The type of combining ability is the choice There are four types of elite combining ability, and the combining ability of high yield is: (?) ≥, at least one of the parents is high (?) And the average of the parents (?) Is .