光温条件对短光低温不育水稻育性转换的影响

短光低温不育水稻是一类与长光高温不育水稻育性转换特性相反的新种质，通过对分期播种材料自然条件下的育性及人工短光处理后的育性比较分析表明，宜DIS的光敏期为第一苞分化期至第二次枝梗原基和小穗原基分化期（幼穗分化I－III期），在常温下光敏期的短日处理可使育性趋于不育，但在高温下光敏期短日不育效应被削弱，宜DIS的花粉育性在高，低温作用下育性的均出现下降，根据高，低温影响育性的资料分析得到的敏感期基本一致，即花粉母细胞形成期至花粉内容物充实期（幼穗分化V－Ⅶ期）。

Effect of photoperiod andtemperature on fertility alteration of short photoperiod-low temperature induced malesterle rice.

Short photoperiod-low temperature induced male sterile rice is a new germplasm, whose fertility alteration characteristic is contrary to that of long photoperiod and high temperature induced male sterile rice. Compared with that of Yid1s sowed under natural conditions by stages, the fertility alteration of Yid1s was observed under simulated short photoperiod treatment. The results showed that the photoperiod-sensitive stage of Yid1s occurred from differentiation of rachis primordia (phase I) to secondary rachis-branch and spikelet primordia (phase III). The panicles induced by appropriate short daylight treatment at photoperiod-sensitive stage tended to be completely sterile under normal temperature, but the sterile effect was weakened under high temperature. The pollen fertility of Yid1s was reduced under high or low temperature. The temperature-sensitive stages of Yid1s based on the analysis of the effects of high and low temperature on fertility were basically identical, i.e., from pollen mother cell formation (phase V) to single nucleus (phase VII).