叠抱大白菜杂种优势利用模式分析

Analysis of heterosis pattern of stacked Chinese cabbage

小棵亲本×大棵亲本是叠抱大白菜杂种优势利用普遍采用的组配模式,但针对这一模式的理论研究尚未见报道。利用22个叠抱大白菜亲本的双列杂交设计,对6个育种基本性状的杂种优势和配合力进行分析。结果表明:小棵亲本和大棵亲本在采收期和产量(毛重和球重)的一般配合力形成了强烈反差,两者在小棵×大棵组配模式中对缩短杂种一代采收期和增加杂种一代产量分别起到关键作用;各种组配模式中,杂种一代在毛重和净重方面普遍具有正向的特殊配合力,这可进一步提高杂种一代的产量。这一研究结果有助于理解叠抱大白菜杂种优势模式形成的遗传理论基础。

The small parent×large parent is a commonly adopted mating pattern among stacked Chinese cabbage F_1 hybrid varieties,but the theoretical study of this breeding pattern has not been reported.In this study,the patterns of heterosis and combining ability were analyzed for 6 basic traits in breeding.The results showed that:the small parents and large parents exhibited a significant differences in terms of harvest time and yield-related traits(gross weight and net weight),and as a result,the two types of parents respectively played key roles in shortening the harvest time and increasing the yield in the hybrid generation in the small parent×large parent mating pattern.The hybrid generation generally possessed positive specific combining ability in gross and net weights,which further increased the yield of the hybrid generation.Results of this study will help to understand the genetic basis for the formation of heterosis pattern in stacked Chinese cabbage.