Abstract: The flowering habits of photo-thermo-sensitive genic male sterile rice (PTGMR) lines Anxiang S, 6442S, 165S, GD2S, 1103S, Pei'ai 64S, 0821S and restorer lines Gui 99, 102 were systematically surveyed. The flowering period of 165S and GD2S is the most concentrated, and the flourishing flowering of 165S is early, that of GD2S is late. The flowering period of 6442S, Pei'ai 64S and 0821S is comparatively concentrated, while that of Anxiang S and 1103S is relatively dispersed. The anthesis time of 165S is comparatively concentrated and these of the others are relatively dispersed. As for the spikelet opening time, Anxiang S, 6442S, 1103S is long, 165S, 0821S and Pei'ai 64S is relatively long, GD2S is the shortest. The order of distance of opened glume tips from big to smallis Anxiang S, 6442S, Pei'ai 64S, 11035, 082S, GD2S, 165S. The opening angle of spikelet of Anxilang S. 6442S and Pei'ai 64S is larger (more than 25°), while that of 165S, GD2S, 1103S and 0821S is smaller (less than 25°). The stigma exsertion rate, Pei'ai 64S is the highest, the following from high to low are 1103S, Anxiang S, 0821S, 165S, 6442S and GD2S, but that of 165S, 6442S and GD2S is less than 60%. The stigma area of 1103S, Anxiang S and 0821S is more than 1. 00 mm², that of other PTGMRs is less than 1. 00 mm². The stigma vitality of 165S, AnxiangS, 1103S, 0821S dropped slowly, that of 6442S, Pei'ai 64S, GD2S dropped fast.

Key words: flowering habit, photo-thermo-sensitive genic male sterile line, spikelets, stigma

摘要： 对光温敏不育系安湘S、6442S、165S、GD2S、1103S、培矮 64S、0821S 和恢复系桂99、102的开花习性进行了系统观察。1356S花期不太集中,午前花所占比例不高;但柱头接受花粉面积大,柱头生命力下降慢,颖花张开时间长,颖间距大,张颖角度大。6442S花时分散,柱头外露率较低,柱头接受花粉面积小,生命力下降快;但其花期集中、张颖时间长、颖间距大。165S颖花张开时间稍短,张颖角度较小,颖间距较小,柱头接受花粉面积较小;但其花期、花时集中,午前花所占比例高,柱头生命力保持时间长。GD2S午前花少,柱头外露率低、面积小、生命力下降快,颖花开张时间短,张颖角度小;但花期集中(抽穗后3～5 d)。1103S盛花开始时间较晚,午前花较少;但颖花开张时间很长,有些当日开的颖花,至次日还未闭合,柱头外露率高、面积大、生命力强且下降速度慢。PA64S柱头面积小,柱头生命力下降快;但花时集中,午前花较多,柱头外露率高,颖间距大。0821S花时分散,午前花少,张颖角度小,颖间距较小;但花期较集中,张颖时间较长,柱头面积大、生命力下降慢。因此,在制种时,应根据各不育系各自开花习性的优缺点,以及所配父本的开花习性,采取趋利避害的技术措施,提高制种产量。

关键词: 开花习性, 光敏核不育系