Critical Temperature and the Thermo sensitive Phase of Pingxiang Dominant Genic Male Sterile Rice

By using phytotron, critical temperature and the thermo sensitive phase of Pingxiang Dominant Genic Male Sterile Rice were studied under artificial conditions. The results showed that critical temperature of the fertility alteration induced by high temperature in homozygous sterile plant and heterozygous sterile plant of Pingxiang Dominant Genic Male Sterile Rice were between 27℃ and 28℃. It indicated that temperature sensitivity of Pingxiang Dominant Genic Male Sterile Rice had no effect of doses of dominant sterile gene. The thermo sensitive phase fertility alteration in Pingxiang Dominant Genic Male Sterile Rice occurred from pollen mother cell formation to meiotic phase, i.e. 18-12 days before heading. The practical utilization of Pingxiang Dominant Genic Male Sterile Rice was also discussed.