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 2 7℃～ 2 8℃ ,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 1 8～ 1 2 d;同时 ,讨论了该不育材料的实际应用问题。 The artificial temperature chamber was used to study the critical temperature and the temperature sensitive period of Pingxiang dominant genic male sterile rice. The results showed that the critical value of fertility transformation of Pingxiang dominant CMS lines and hybrid sterile lines induced by high temperature ranged from 27 ℃ to 28 ℃, indicating that high temperature induced Pingxiang dominant genic male sterile rice There was no dose-effect of dominant-negative gene in sexual transformation. The temperature-sensitive period of fertility transition in Pingxiang Dominant Genic Male Sterile Rice was between 18 and 12 days before heading stage at pollen mother cell formation to meiosis stage, The practical application of the sterile material was discussed.