萍乡显性核不育水稻临界温度值及其温度敏感期的研究

利用人工气候箱研究了萍乡显性核不育水稻临界温度值及其温度敏感期。试验结果表明高温诱导萍乡显性核不育水稻纯合不育株和杂合不育株育性转换的临界值均为27℃～ 28℃, 说明高温诱导萍乡显性核不育水稻育性转换不存在显性不育基因的剂量效应; 萍乡显性核不育水稻育性转换温度敏感期在花粉母细胞形成期至减数分裂期, 即抽穗前18～ 12 d;同时, 讨论了该不育材料的实际应用问题。

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.