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１９８９年７月下旬至８月上旬的异常低温对８ 月中旬前后抽穗的ＮＰＧＭＲ的育性产生了不同程度的影响。利用这种自然长日照低温条件，对同期抽穗的３１００５Ｓ、Ｗ７４１５Ｓ，农垦５８Ｓ等５个类型不育系的育性进行了鉴定。新育成的中粳型光放系３１００５Ｓ５３９株不育株率１００％，１４７株套袋自交小穗不育度达９９．９９％，花粉败育率为９９．０２％，与晚粳型的原始农垦５８Ｓ相当。因此初步认为３１００５Ｓ具有育性表达对低温反应不敏感的特点。由于其在短日照季节割蔸再生的自然结实率可达３３．１２％，表明其育性转换明显。
The abnormal low temperature from late July to early August 1989 affected the fertility of NPGMRs heading around mid-August. The natural long-day low-temperature conditions were used to identify the fertility of five types of CMS lines, 31005S, W7415S and Nongken 58S. The newly-bred japonica photoperiod 31005S539 strain was 100% sterile, the 147-bagged selfing spikelet had a sterility of 99.99% and the pollen abortion rate was 99.02% The original Nongken 58S quite. So it is preliminarily thought that 31005S has the characteristics that fertility expression is insensitive to hypothermia. Natural regeneration rate of 33.12% due to its cutting and regeneration in the short sunshine season, indicating that its fertility conversion significantly.