光周期和温度对水稻雄性不育系龙特浦A育性恢复的影响

Effect of Photoperiod and Temperature on Pollen Fertility Restoration of Cytoplasmic Male Sterile Rice─Longtepu A

用人工光周期和温度处理龙特浦Ａ．并在自然条件下分期播种，研究其育性不稳定的原因．人工气候试验结果表明：花粉育性波动与温度有关，而与光周期无关，且不存在光温互作．在试验范围内，温度越高则育性越高，两者呈极显著正相关．但导致自交结实率的最高温度不是３０．１℃，而是２６．６℃，表明存在一个有利自交结实的最适温度．在自然条件下，抽穗前７－１２ｄ，日均温２５－２７℃将诱导其育性部分恢复，而在超过这个范围的较高或较低温度下，其不育性稳定．

The effects of photoperiod and temperature on fertility restoration of Longtepu A,a cytoplasmic male sterile rice were investigated under the artificial and the natural climate conditions.In phototron,Longtepu A was treated with the. combinations of four average day-temperature-23.1, 24.1, 26.6 and 30.1℃ , and two day-lengths-12.5 and 14.0 h. Experiment in phototron revealed that the pollen fertiliy restoration of Longtepu A was affected only by daily temperature.The effects of photoperiod and photoperiod× temperature interaction were non-significant.The highly significant correlation between daily temperature and pollen fertility was found.However,the highest seed-setting appeared when daily tempera. ture was 26.6℃,but not 30.1℃ .Under natural climate condition, partial pollen fertility restoration was found when daily temperature during the period of 7-12 days before heading ranged from 25℃ to 27℃ . The male sterility was stable when the daily temperature was under 25 ℃ or above 27 ℃ .