【摘要】 对甘蓝型油菜与芥菜型油菜正反杂交的胚胎学观察表明,甘蓝型油菜作母本时,授粉后柱头乳突细胞内有明显的胼胝质沉积,异种花粉管常常不能进入乳突细胞;杂种胚和胚乳发育迟缓,胚至心形期后便不能继续正常发育,胚乳停滞在游离核阶段并最终败育。反交时花粉管生长正常,但受精和胚的发育都落后于芥菜型油莱自交。除有少数畸形胚出现外,芥菜型油菜x甘蓝型油菜的杂种胚一般均能发育至成熟。更多还原

【Abstract】 The embryology of reciprocal crosses between Brassica napus and B. juncea was studied. When B. napus was used as maternal parent, pollen tubes of B. juncea could not penetrate papillar cells in which the callosity were heavily deposited after cross pollination. The Embryos and endosperm of B. napus × B.juncea developed slowly and then ceased to develop at the heart-shaped embryo stage and free nuclei endosperm stage respectively. In the reciprocal cross, pollens germinated and pollen tube grew normally but fertilization and embryo growth fell behind that of self-pollination of B. juncea. Although a few abnormal embryos occurred, most of the hybrid embryos could develop into maturation.更多还原