继《玉米从授粉到籽粒成熟期有无杂种优势的探讨》后,又做了单交种姊妹交去雄、姊妹交与杂交去雄等项对比试验,再次证明玉米杂交后胚胎阶段有杂种优势。玉米是典型异花授粉作物,杂交后父本的染色体不但参与双受精,而且控制胚和胚乳发育的基因同母本基因一齐发挥作用,表现出胚乳直感作用;即粒色的改变、千粒重增加等。不同单交种再杂交,胚胎阶段的优势有大有小,正反交的结果也有差异。所以在利用胚胎期杂种优势前,应先做优势鉴定试验,再采 Following the “corn from pollination to grain ripening without heterosis discussion”, but also made a single cross-sibling to male, sibling and cross-male to male and other items of comparative tests, once again proved that hybrid embryos post-hybridization heterosis . Maize is a typical cross-pollination crop. After crossing, the paternal chromosome not only participates in double fertilization but also controls the development of embryo and endosperm together with the maternal gene to show the direct effect of endosperm; that is, the change of grain color, increase of 1000-grain weight, etc. . Different single cross and then hybridization, the advantage of the embryo stage is big and small, the results of the reciprocal cross is also different. So in the use of embryonic heterosis, should first do the advantages of identification test, and then mining