粳型水稻光敏核不育系皖2304S的选育及特征特性

目的]介绍光敏核不育系皖2304S的选育过程、育性表现、抗病性和农艺性状。方法]以粳稻光敏核不育系7001S为母本,与双九杂交,经4年7代选择育成了粳稻光敏核不育系皖2304S(简称2304S)。结果]2009年8月12～28日,2304S表现雄性不育,镜检花粉败育率99.54%～100.00%,套袋自交结实率0～0.07%;8月31日至9月21日,表现雄性可育,镜检花粉败育率79.94%～99.79%,套袋自交结实率0.56%～28.76%。2010年8月2日至9月1日,表现雄性不育,镜检花粉败育率99.53%～100.00%,套袋自交结实率0～0.36%,稳定不育期31 d;9月3～17日,表现雄性可育,镜检花粉败育率96.38%～99.46%,套袋自交结实0.57%～18.82%。长日不育起点温度低于24.0℃。田间种植对水稻条纹叶枯病抗性较强。结论]该不育系稳定不育期30 d以上,适宜选配中粳组合。

Breeding and Characteristics of Photoperiod Sensitive Genic Male Sterile Line Wan 2304S in Japonica Rice

Objective] The purpose of the research was to introduce the breeding process,fertility performance,disease resistance and agronomic characters of photoperiod sensitive genic male sterile line Wan 2304S.Methods] With photoperiod sensitive genic male sterile line 7001S in japonica rice as female parent,it was hybridized with Shuangjiu,the photoperiod sensitive genic male sterile line Wan 2304S in japonica rice was bred through selection for 7 generations in 4 years.Result] From Aug.12nh to 28th in 2009,Wan 2304S showed male sterility,its pollen abortive rate in microscopic examination was 99.54%-100.00%,its bagged seed setting rate was 0-0.07%.From Aug.31st to Sep.21st,it showed male fertility,its pollen abortive rate in microscopic examination was 79.94%-99.79% and its bagged seed setting rate was 0.56%-28.76%.From Aug.2nd to Sep.1st in 2010,Wan 2304S showed male sterility,its pollen abortive rate in microscopic examination was 99.53%-100.00%,its bagged seed setting rate was 0-0.36% and its steady sterile period was 31 d,from Sep.3rd to Sep.17th in 2010,it showed male fertility,its pollen abortive rate in microscopic examination was 96.38%-99.46% and its bagged seed setting rate was 0.57%-18.82%.Under long photo period,the critical temperature for inducing male sterility was lower than 24 ℃.The resistance of Wan 2304S planted in field to rice stripe disease was stronger.Conclusion] The steady sterile period of this sterile line was longer than 30 d,so it was suitable for matching middle japonica combination.