水稻光温敏核不育系的开花习性观察

The flowering habits of photo-thermo-sensitive genic male sterile rice (PTGMR ) Iines Anxia ng S,64425, 165S, GD2S, 11035, Pet'ai 645, 0821S and restorer lines Gui 99, 102 were systematically surveyed. Theflowering period of 165S and GD2S is the most concentrated, and the flourishing flowering of 165S is early, that ofGD2S is late. The flowering period of 6442S,Pei'ai 645 and 08215 is comparatively concentrated, while that of An-clang S and 1103S is relatively dispersed. The anthesis time of 1655 is comparatively concentrated and these of theothers are relatively dispersed. As for the spikelet opening time, Anxiang S, 64425, 11035 is long, 165S, 0821Sand Pet'ai 64S is relatively long, GD2S is the shortest. The order of distance of opened glume tips from big to smallis An-clang S, 64425, Pet'ai 645, 11035, 082iS, GD2S, 165S. The opening angle of spikelet of An-clang S.64425and Pet'ai 645 is larger(more than 25°),while that of 165S,GD2S, 1103S and 0821S is smaller(less than 25°). Thestigma exsertion rate, Pet'ai 645 is the highest, the following from high to low are 1103S,Anxiang S, 08215, 165S,64425 and GD2S, but that of 165S, 64425 and GD2S is less than 60%. The stigma area of 1103S,Anxiang S and0821S 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, Pet'ai 645,GD2S dropped fast.