光温敏核不育系转育起点温度的高低是决定两系杂交水稻制种能否安全的关键因素之一，选育起点温度较低的光温敏核不育系可以显著提高两系杂交水稻制种纯度。本课题组利用系谱选育法，将播始历期较短、不育起点温度较高、农艺性状较好的两系不育系中间材料7HS006与播始历期较长、育性转换温度较低的绿102S进行杂交，选育出籼型两系不育系H153S，该不育系的不育起点温度较低，育性稳定，可繁性、农艺性状较好。H153S将在两系杂交水稻制种和推广中起重要的实际应用价值。

Low critical temperature of photo-thermo sensitive genic male sterile （PTGMS） line is one of the critical factors; it could improve seed purity by breeding the lower critical temperature of PTGMS line. H153S is a PTGMS line, bred by Rice Research Institute, Anhui Academy of Agricultural Sciences derived from the middle breeding materials 7HS006 and Lv102S. 7HS006 has the characteristics of shorter initial heading period, higher critical temperature of male fertile PTGMS line and well agronomic traits. LV102S line is a low critical temperature of PTGMS line. H153S has the characteristics of stable fertility, well reproduction ability and well agronomic traits, it would have important practical application value for two-line hybrid rice seed production and two-line hybrid rice extension.