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《Hybrid Rice》 2005-03
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Analysis of Genetics and Correlation on Grain Characters in Two-line Hybrid Rice

PENG Xiao-song, ZOU Xiao-yun, HE Hao-hua*, LIU Yi-bai, FU Jun-ru, LUO Xiao-jin, CHEN Xiao-rong, HE Xiao-peng(College of Agronomy, Jiangxi Agricultural University, Nanchang, Jiangxi 330045, China)  
Using five S lines and 22 male parents as the materials, a 5×22 incomplete diallel cross was carried out for studying the inheritance of the grain characters in two-line hybrid rice. The results showed that the grain length, width, length/width ratio and 1 000-grain weight were all mainly governed by additive effects and significantly affected by both male and female parents at 1% level. 1 000-grain weight, the grain length, width, and length/width ratio had all a very high broad heritability (h2_B) of 99.24%, 98.80%, 93.50% and 97.42%, respectively. The correlated coefficients between 1 000-grain weight and the grain length, width and length/width ratio were positively significant at 1% level; that between grain length and length/width ratio was positively significant at 1% level, but that between grain length and width was not significant, that between grain width and length/width ratio was negatively significant at 1% level. The results of path analysis indicated that direct path coefficients of 1 000-grain weight, grain length, and width to length/width ratio were 0.003 1, 0.888 6 and-0.560 0, respectively, the indirect path coefficients of 1 000-grain weight to length/width via grain length and width reached 0.606 9 and-0.349 3, respectively.
【Fund】: 江西省新世纪学术与技术带头人培养计划;; 江西省自然科学基金(0430062);; 江西省科技攻关项目资助
【CateGory Index】: S511
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