Abstract: Difference of cold-water response, general combining ability effects, genetic parameters, correlation among cold-water response index (CRI) of several agronomic traits were analysed by using 45 F 1s obtained from half diallel crosses among 10 rice cultivars.Both general combining ability (GCA) effects and specific combining ability (SCA) effects were highly significant in days to heading, culm length, panicle length, spikelets per panicle, seed setting rate and panicle exsertion.The variance of GCA was much larger than that of SCA in all above traits. Cold-water response index (CRI) of main agronomic traits for Tong 88-7, Gaochan 102 and TR22183 were much larger than those of others, and GCA effects of these varieties on CRI of main agronomic traits were higher than those of others.The frequency of positive and negative alleles, and the proportion of dominant and recessive alleles in the parents for culm length and its CRI were equal. Culm length and its CRI were affected by a few major genes, and these traits had high narrow-sense heritability. CRI for panicle length, spikelets per panicle, seed setting rate and panicle exsertion were positively correlated with CRI of culm length. CRI of seed setting rate was positively correlated with CRI of panicle exsertion.

Key words: rice, cold-water response index, general combining ability, agronomic traits, genetic parameter

摘要： 利用10个水稻品种配制45个半双列杂交组合，并在冷水处理下探讨了水稻主要农艺性状的冷水反应差异、配合力和遗传参数，以及冷水反应指数间的相关关系。研究表明，抽穗天数、秆长、穗长、穗粒数、结实率和穗颈长等农艺性状冷水反应的一般配合力和特殊配合力均呈显著，且一般配合力的变异大于特殊配合力的变异；水稻品种的冷水反应有着明显的差异，其中通887、高产102和TR22183等品种的冷水反应较迟钝，并对主要农艺性状的冷水反应指数（CRI）具有较高的一般配合力。亲本中控制秆长及其CRI值的正、负等位基因的频率基本相等，显隐性基因频率基本相同；秆长的表现型值及其CRI值受少数主效基因控制，具有较高的狭义遗传力。穗粒数、穗颈长和结实率及其CRI值与秆长的CRI值呈显著正相关，结实率的CRI值与穗颈长的CRI值呈显著的正相关。

关键词: 水稻, 冷水反应指数, 一般配合力, 农艺性状, 遗传参数