1. Then the uninucleate embryo sac forms 7-celled or 8-nucleate embryo sac of polygonum type following its three times division successively.

2. The uninucleate Rhizoctonia is the first report in China and also the first report as a pathogen of turf-grasses.

3. The anthers were sterile under long daylight exposure. Some anthers occurred to abort before uninucleate pollen stage, but others were sterile after binucleate pollen stage.

4. The intine of the pollen began to form in the middle stage of uninucleate microspore.

5. The results showed that the microspore abortion occurred at the stage of microspore mother cell, tetrads and uninucleate microspore.

6. Some large vacuoles appeared in the tapetal cells of the sterile anthers at the early uninucleate pollen stage.

7. The results showed that it was necessary to isolate microspores in the late uninucleate stage.

8. In meiosis, the pollen mother cells that abnormally acted made up about 10.28% and the male gametophytes abnormally acted at a frequency of 3.2% and mainly aborted at uninucleate stage.

9. Haploid plantlet and callus were induced from the anther culture of Dioscorea zingiberensis as the explant at the stag of later uninucleate period.