Abstract: Using photo-thermo sensitive genic male sterile lines (PTGMS) Pei′ai 64S, W7 415S, W6154S, N26S, Annong S, Nongken 58S, 7001S, and 5008S as female parents, a nd conventional indica rice 8258, and U89 as male parents, affecting factors for outcrossing seed-setting were analyzed. Results showed that PTGMS had outcros sing-seed-setting obstacles affected by inheritance and environment at varyi ng degree, environment temperature was the main factor, the sensitive time was at the early grain filling stage for outcrossing seed-setting. It existed sig nificant differences in the sensitive stage, the length of sensitive stage, the sensitive level and the effective level of outcrossing seed-setting obstacles a ffected by environment temperature among different PTGMS.

Key words: rice, photo-thermo sensitive genic male sterile line, outcrossing seed-setting, affecting factor, temperature, sensitive stage, correlationship

摘要： 以水稻光温敏核不育系培矮64S、W7415S、W6154S、N26S、安农S、农垦58S、7001S和5008S为母本，常规籼型品系8258和U89为父本，分期播种后进行杂交，对影响水稻光温敏不育系异交结实障碍的因素进行了分析。结果显示，水稻光温敏核不育系存在不同程度的遗传异交结实障碍和环境异交结实障碍；环境对不育系异交结实的影响因素主要是环境温度，影响的敏感时期主要是籽粒灌浆充实前期；不同的不育系，环境温度对其异交结实影响作用的敏感时期、敏感期长短、敏感程度和影响程度均有明显差异。

关键词: 水稻, 光温敏核不育系, 异交结实, 影响因素, 温度, 敏感期, 相关性