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对甘蓝型油菜显性细胞核雄性不育系宜３Ａ 花药发育过程中的显微结构和超微结构的观察结果表明， 宜３Ａ 雄性败育发生于花粉母细胞阶段， 其主要特点是花粉母细胞不进行减数分裂， 不能形成二分体或四分体； 花粉母细胞原生质体浓缩并逐步收缩， 最后解体； 在相当于正常油菜的单核小孢子阶段， 花粉母细胞壁上形成“类花粉壁”； 同时， 其绒毡层细胞质浓缩， 并逐步解体。
Observations on the microstructures and ultrastructure of anther development in Brassica napus L. susceptible to Brassica campestris-3 a showed that male sterile ABA should occur in the stage of pollen mother cells, and its main feature is that pollen mother cells do not Pollen mother cell protoplasts were concentrated and gradually shrunk and finally disintegrated. At the stage of mononuclear microspore which corresponded to normal rapeseed, “pollen-like wall” was formed on the cell wall of pollen mother cells, At the same time, the tapetum cytoplasm was concentrated and gradually disintegrated.