Some abnormalities in the development of embryo sac were founded in autotetraploid rice, including: cell degeneration, nuclei in abnormal position and number, the abnormal differentiation, and soon.

• 除正常发育的过程外，大孢子发育的各个过程均出现一些异常现象，包括：细胞退化、核位置异常、核数目异常和细胞分化异常等。