The result showed that the microspore mother cell of male sterile line could pass through meiosis and form tetrads and then tetrads could release microspore as the same as fertile line.

• 观察结果表明：大葱雄性不育系和保持系的小孢子母细胞都能正常进行减数分裂，四分体可以释放出小孢子。