用日均温20℃低温处理3个采用剑叶叶枕距标记幼穗发育时期的粳型光温敏核不育系G317S、G321S和G326S,研究低温对不同发育时期粳型光温敏核不育系育性的影响。结果表明:用20℃低温处理3 d,3个粳型光温敏核不育系花粉不育度明显降低,平均自交结实率为66.41%;3个粳型光温敏核不育系育性敏感期所对应的剑叶叶枕距为-4～4 cm,而剑叶叶枕距<-4 cm或>4 cm时,各不育系育性稳定;剑叶叶枕距为-4～-2 cm和2～4 cm时各不育系不同穗位颖花的花粉不育度比较接近,而剑叶叶枕距为-2～2 cm时,各不育系不同穗位颖花的花粉不育度表现为穗上部<穗中部<穗下部。 Three japonica thermo-sensitive genic male sterile lines, G317S, G321S and G326S, were used to detect the developmental stages of panicle during the period of panicle development using the mean daily temperature of 20 ℃. The effects of low temperature on the photosynthetic rate Effects of fertility on fertility. The results showed that the pollen sterility of three japonica thermo-sensitive genic male sterile lines significantly decreased with an average of 66.41% self-pollination rate after 3 days of treatment at 20 ℃. Three japonica thermo-sensitive genic male sterile lines Sensitive period corresponding to the flag leaf distance between the leaves is -4 ~ 4 cm, and the flag leaf distance <-4 cm or> 4 cm, fertility of each sterile line; flag leaf pitch is -4 The pollen sterility of spikelets at different ear positions was similar at ~ -2 cm and 2 ~ 4 cm, but at the spike distance of -2 ~ 2 cm, The pollen sterility showed the upper part of spike