Abstract: Changxuan 3S,a thermo-sensitive genic male sterile(TGMS) line with eui gene,is derived from Pei′ai 64S by irradiation of 350 Gy 60Co γ-ray.In order to elucidate the uppermost internode elongation of TGMS line with eui gene,Changxuan 3S and its parent Pei′ai 64S were used to study the effect of temperature on panicle exsertion.At 24℃,the uppermost internode of Changxuan 3S elongated fastest from the 4th day before flowering to 0 day(flowering),being 2.1-fold as that of Pei′ai 64S,whereas it elongated slowly during the 12th to 4th day before flowering and the 1st to 3rd day after flowering.The uppermost internode of Changxuan 3S exserted from flag leaf sheath at 22℃,24℃ and 26℃,and the length of elongated uppermost internode increased with the decreasing temperature.At 28℃,the panicles of Changxuan 35 were enclosed in the leaf sheath,but the degree of panicle enclosure was obviously lower than that in Pei′ai 64S.Cytological studies on Changxuan 3S showed that the uppermost internodes elongation was attributed to the increase of cell number and cell elongation,and the latter was more significant.Moreover,the number of outermost and innermost parenchyma cells and the cell length in the uppermost internode reduced with the increasing temperature.

Key words: rice(Oryza sativa), thermo-sensitive genic male sterility, elongated uppermost internode gene, panicle exsertion, temperature

摘要： 以隐性长穗颈温敏核不育水稻长选3S及其亲本培矮64S为材料，研究了温度对长选3S穗颈伸长的影响。人工24℃条件下，在始花前第12天至始花前第4天和始花当天至始花后第3天两个时段，穗颈节间伸长速度慢，但从始花前第4天至始花当天，长选3S穗颈节间伸长速度最快，其节间日均伸长的长度是培矮64S的2.1倍。在敏感期分别进行22℃、24℃、26℃和28℃ 4种人工温度处理， 28℃条件下穗颈节间伸长受阻, 出现包颈现象；22~26℃条件下穗颈伸出长度都为正值，不包颈，且穗颈伸出剑叶叶鞘的长度随温度降低而增加。对穗颈节间细胞数目和细胞长度的比较分析表明，长选3S穗颈节间的伸长主要是始花前第12天至始花期节间细胞分裂和细胞伸长共同作用所致，其中后者作用更为显著，且随处理温度的升高，穗颈节间最内和最外层薄壁细胞数目减少，细胞平均长度下降。

关键词: 水稻, 温敏雄性核不育, 长穗颈基因, 穗伸出度, 温度