关键词: 水稻, 培矮64S, 光温反应特性, 不育起点温度, 育性转换

Abstract: 【Objective】The characteristics of photo-thermo reaction of Peiai64S lines collected from different sources and different years were analyzed. The change reasons of critical temperature of fertility transformation were discussed.【Method】 The self-fertility and pollen fertility of five Peiai64S lines were analyzed by different photo-thermo treatments in phytotrons.【Result】 Five lines were almost completely sterile under long day light and high temperature (14.5h/28℃), however, under the condition of 14.5h/24℃, except for two lines which kept sterile, the rests were partly fertile, especially the line 4 whose self-fertility rate and pollen fertility was as high as 9.05% and 27.83%, respectively, that was very significant different from the others. The self-fertility of Peiai64S lines collected from the same source but different years were compared and the difference was also found. 【Conclusion】The results indicated that there was a significant difference among Peiai64S lines collected from different regions and different years. The critical temperature of fertility transformation in the line 4 raised and was out of the identification standard of photoperiod and thermoperiod genic sensitive sterile line.

Key words: Rice, Peiai64S, Characteristics of photo-thermo reaction, Critical temperature of sterility, Fertility transformation