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在现蕾期和开花期对二倍体矮脚黄白菜自交、四倍体矮脚黄白莱自交和以四倍体矮脚黄白菜为母本、二倍体矮脚黄为父本杂交的白菜进行胚胎学观察。结果表明，二倍体和四倍体白莱自交的均能正常受精和进行胚胎发育，最终形成正常的种子，但四倍体白菜的受精和胚胎发育均落后于二倍体白菜；四倍体白菜和二倍体白菜杂交的受精和早期胚胎发育正常，但胚乳一般在游离核阶段发生退化，到授粉后１６ｄ，胚乳完全消失．由于胚乳过早解体，胚发育到球形原胚时发生退化，因而无法获得成熟的三倍体种子。
In the budding and flowering stage of diploid yellow-white cabbage self-bred, tetraploid bass yellow self-bred and tetraploid yellow-white cabbage as the female parent, diploid dwarf yellow as the male parent hybrid Cabbage embryological observation. The results showed that the diploid and tetraploid Baili self-fertilization can be normal fertilization and embryo development and eventually form a normal seed, but tetraploid cabbage and fertilization and embryo development lag behind diploid cabbage; four times Fertilization and early embryo development were normal in hybrid cabbage and diploid Chinese cabbage, but the endosperm generally degenerated in the free nuclear stage. After 16 days of pollination, the endosperm completely disappeared. Due to premature disintegration of the endosperm, degeneration occurs when the embryo develops into a globular proembryo, making it impossible to obtain mature triploid seeds.