Abstract: The sterility of the photo -thermo -stnsitive genic male sterile (PTGMS) lines was affected by the age of plant in Guangzhou, the longer the age of plant was, the higher the critical photoperiod and temperature inducingsterility was and the shorter the sterile period was. The characteristics varied among PTGMS lines. The effect of the age of plant on sterility was a progressively accumulating quantitative changing process. The difference of sterility would be expressed in an interval of twenty days of the age of plant, the more the disparity in the age of plant was, the more the difference of sterility was. The effects on sterility would tend to be stable or change conversekt when the disparity of the age of plant reached a fairly high level.

Key words: age of plant, photo-thermo-sensive genic male sterility, ratooning plant

摘要： 在广州自然条件下，光温敏核不育水稻的育性受株龄的影响，株龄较长的植株，不育光温临界值较高，不育期较短。不同的不育系，这一特性差异较大。株龄对育性的影响是一个逐步累加的量变过程，株龄相差20 d育性就显出差异，随着株龄差增大，育性差异增加。当株龄的差值达到一定程度后，对育性的影响会趋于稳定或反方向变化。

关键词: 光温敏核不育, 株龄, 实生株, 再生株