大白菜雄性败育的显微结构观察

通过对核质互作型雄性不育系169A和核雄性不育两用系88_3的细胞形态解剖学观察表明，两个不育系在开花时雄性细胞均表现100%的败育，花药的表皮细胞均具有生活力，但败育形式、时期、特点各异。169A败育发生于孢原细胞前后，以孢原细胞退化，或转变成薄壁细胞为主要特点。88_3败育从小孢子母细胞至二核花粉粒皆有发生，高峰期在四分体前后（约占80%），小孢子母细胞不能进入减数分裂和不能完成减数分裂及小孢子不能正常发育是败育的主要形式，但败育特点均是败育一旦发生便是急剧而彻底的解体或凝集成一团。

Observation on Microstructure of Male Abortion in Chinese Cabbage

The morphological anatomical characters of the anthers from nucleo_cytoplasmic interaction male sterile line 169A and genic male sterile line 88_3 were observed. The results showed that the epidermal cells of the anther had viability,while the male sex cell of the two sterile lines appeared 100% abortion at blooming date, however,their abortion form,duration and characters were different.The abortion of 169A occurred before to behind of the sporogonia,whose important characterization was that the sporogonia degenerated or transformed into the parenchyma cells. The abortion of 88_3 ocurred from the microspore mother cells to pollen grains of two_nucleus,while the high peak stage of abortion(80%) occurred before and after the tetrad phase. The main abortion forms of 88_3 were that the microspore mother cells were not able to enter meiosis process and to finish meiosis,and the microspores were not able to develop normally.The same abortion character of the two male sterile lines was that the microspore mother cells and microspores sharply and thoroughly disintegrated or aggregated when abortion occurred.