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《Journal of Hunan Agricultural University(Natural Sciences)》 2012-06
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Combining ability of head rice percentage in tow-line hybrid rice

CHEN Guang-hui,YANG Hua,ZHOU Qing-ming,WANG Jian-long (College of Agronomy,Hunan Agricultural University,Changsha 410128,China)  
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).
【Fund】: 国家科技支撑计划项目(2011BAD16B01);; 湖南省自然科学基金项目(07JJ5061);; 长沙市科技项目(BK0743)
【CateGory Index】: S511
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