选用六个不同类型光敏核不育水稻,在其五叶期后给予不同时间的光照处理,观察其抽穗期的差异。结果表明:在光长由14.5小时缩短到10.0小时,供试不育系的抽穗期提早6-41天;促进不同品系间提早抽穗的临界光长存在差异:农垦58S,中78-5S,25169S,5-12S为12.5小时,W6417S为13.5小时,W6154S的则不甚明显。 Six different types of photoperiod-sensitive genic male sterile rice were selected and treated with light at different leaf stages to observe the differences of their heading date. The results showed that the heading date of tested CMS lines was increased by 6 to 41 days in the shortening of light duration from 14.5 hours to 10.0 hours, and the difference of the critical light lengths to promote early heading among different lines was as follows: Nongken 58S, Zhongs 78-5S, 25169S 12.5 hours for 5-12S, 13.5 hours for W6417S, and less pronounced for W6154S.