水稻反向温敏不育系在寒地稻区的育性表现

反向温敏不育系雁农S具有高温可育和低温不育特性,该研究对雁农S及其转育而来的粳型反向温敏不育系在黑龙江哈尔滨地区的育性表现进行了探讨.多年的田间观察结果表明,水稻反向温敏不育系雁农S在黑龙江哈尔滨地区的全年最高温时段7月下旬至8月下旬)败育彻底,不会发生育性转换,自交结实率为0,推测其不育起点温度高于28℃;由雁农S转育而来的大多数粳型反温敏不育株系在7～8月都能完全败育而不发生自交结实现象,表明雁农S来源的不育系在寒地稻区的不育安全期长,不育特性相对稳定,为推动寒地杂交粳稻发展及实现原地制种提供了理想的遗传工具.

Characterization of Reverse Thermo-sensitive Genic Male Sterile Lines in Cold Regions of China

Yannong S,a reverse thermo-sensitive genic male sterile (TGMS) line,is sterile at high temperature and fertile at low temperature.In the present study,the fertility of Yannong S and the japonica reverse TGMS lines derived from it was investigated in Harbin,Heilongjiang from 2013 to 2015.The results showed that Yannong S was completely male sterile in July and August (the hottest months of the year in Harbin),and the seed setting rate of bagged panicles was 0.We also inferred that the critical temperature for inducing the sterility of Yannong S was higher than 28 ℃.Most of the japonica reverse TGMS lines derived from Yannong S were completely aborted in July and August,with a seed setting rate of 0.It can be concluded that the reverse TGMS lines derived from Yannong S are genetically stable lines that have a long period of sterility in cold regions,so they may be the ideal genetic materials for the development and in-situ seed production of japonica hybrid rice.