中国与南亚水稻恢复系资源产量性状的配合力分析

目的]分析中国与南亚水稻恢复系资源产量及其构成要素的一般配合力差异,为引进与利用南亚资源提供参考.方法]按照NCⅡ设计,将来自中国和印度等国的37份恢复系材料分别与46A、泸98A和德香074杂交,获得111份杂交种作为试验材料.在四川泸州和德阳两个环境下,分析8个产量性状的配合力.结果]在两种环境下,8个性状在组合间、恢复系间、不育系间、不育系×恢复系间均达到显著或极显著差异水平,说明各组合间基因效应确实存在着遗传差异;亲本一般配合力方差均大于特殊配合力方差,表明这些性状受到基因加性效应的影响.恢复系对杂种一代性状的影响大于不育系.来自印度和孟加拉的9份材料的有效穗一般配合力在两个环境中都排在前15位.结论]中国与南亚恢复资源产量性状配合力有一定的差异,印度和孟加拉资源有效穗配合力好于中国资源,中国资源其他性状一般配合力优于南亚来源材料.

Combining Ability of Yield Traits of Rice Restorer Lines in China and South Asia

Objective] This study was conducted to analyze the difference in the general combining ability of yield traits of rice varieties in China and South Asia and to provide reference for the introduction and utilization of rice restorer lines from South Asia.Method] A total of 111 hybrids were obtained by crossing 37 restorer lines in China and South Asia with Gang 46A,Lu 98A and Dexiang 074 following a NC Ⅱ design.The combining ability of eight yield traits of the hybrids was analyzed in Luzhou and Deyang bases of Sichuan Province.Result] In both bases,the eight yield traits had significant or extremely significant differences between the combinations,restorer lines,sterile lines or sterile line ×restorer line,suggesting that there were differences in the genetic effects between the combinations or lines.The general combining ability (GCA) variances were all higher than special combining ability (SCA) variances in parents,which indicated that these traits were affected by gene additive effect.Restorer lines contributed more to F1 generation than male sterile liens in the eight yield traits.Nine restorer lines from India and Bangladesh were ranked in the top 15 lines with high GCA in the number of productive tillers in both bases.Conclusion] There was significant differences in the combining ability in the eight yield traits between the restorer lines from China and South Asia.The lines from India and Bangladesh were better than those from China in the GCA of the number of productive tillers,and the lines from China were better than those from India and Bangladesh in the GCA of other traits.