两系杂交水稻整精米率的配合力研究

选用6个籼型光温敏不育系作母本，6个恢复系作父本，配制两系杂交水稻组合36个，进行两系杂交水稻整精米率性状配合力遗传研究。相关性分析结果表明，两系杂交水稻杂种F1谷粒整精米率与父本(恢复系)和母本(不育系)的谷粒整精米率呈显著正相关，相关系数分别为0.233 2和0.264 1。6×6不完全双列杂交配合力分析结果表明，两系杂交水稻F1谷粒组合间整精米率差异有统计学意义；父、母本的一般配合力效应和组合的特殊配合力效应差异有统计学意义；父、母本的一般配合力作用大于组合的特殊配合力作用，一般配合力方差占总基因型方差的65%，特殊配合力方差占35%，一般配合力作用中，父本的作用(基因型方差为63.70)大于母本的作用(基因型方差为55.34)。

Combining ability of head rice percentage in tow-line hybrid rice

Thirty-six combinations were obtained using 6 photo-thermo-sterilities as female parentages and 6 restoring lines as male parentages to investigate the combining ability of head rice percentage in two-line hybrid rice. correlation analysis showed that head rice percentage of hybrids (F1) was significantly positively correlated to that of the male (restoring lines) and female (restoring lines) parentages, with correlation coefficient being 0.233 2 and 0.264 1 respectively. Analysis of combing ability for hybrids obtained by 6×6 incomplete diallel cross method showed that the difference of head rice percentage among F1 combinations was significant; the difference between general combining ability (GCA) in parentages and special combining ability (SCA) in combinations was significant in regard to head rice percentage. GCA in parentages played a greater role compared to the SCA in combinations. The variance of GCA occupied 65% of the whole genotype variance and that of SCA occupied 35%. And male parentages (genotype variance was 63.70) contributed more to GCA compared to the female parentages (genotype variance was 55.34).