两个籼型水稻核不育系育性温光反应的研究

在杭州男单通过分期播种，比较了两个籼稻光温敏核不育系的育性及其转换特性。结果表明，光照长度对浙大247S和培矮64S两不育系育性表达的影响小，温度起主导作用，均属温敏型不育系，且日最低温度对不育系育性效应显著高于日平均温度和日最高温度。不育系浙大247S和培矮64S的温度敏感期分析是抽穗前3-18和6-21d，育性转换的临界日期为9月19日和9月25日，转换临界温度为25.28和25.66℃，与培矮64S相比，浙大247S不育期败育较彻底，可育期较长且自交结实率高，在杭州田间可以繁种。

Response of indica rice in two genic male-sterile lines to temperature and photoperiod

Investigations on the fertility conversion of two photoperiod- and temperature sensitive genic male-sterile lines Zheda 247S and Peiai 64s under natural conditions in Hangzhou showed that there was a little impact of photoperiod on their fertility expression, while temperature was the main factor. Among daily mean temperature, daily maximum temperature and daily minimum temperature, the last one had the most significant correlation with the fertility. The temperature sensitive stage of Zheda 247S and Peiai 64S was 318 and 621 days before heading, the critical temperature of their fertility conversion was 25.28 and 25.66 degrees C, and the critical date was September 19th and September 25th, respectively. Compared to Peiai 64S, Zheda 247S had a more evident fertility conversion, its sterility was more complete and its self-setting percentage was higher at fertile stage, and the duration of the fertile stage was longer. Zheda 247S could be reproduced in Hangzhou.