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《Journal of Anhui Agricultural Sciences》 2009-18
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Genetic and Correlation Analysis of Grain Characters in Three-line Hybrid Rice

ZOU Xiao-yun et al(College of Agronomy,Jiangxi Agricultural University/Key Laboratory of Crop Physiology,Ecology,Genetic and Breeding,Jiangxi Province,Nanchang,Jiangxi 330045)  
[Objective] This study was to understand the genetic dynamics of three-line hybrid rice,and explore the respective effect of sterile line and restoring line on grain characters of hybrid rice.[Method] Four three-line sterile lines and 27 restoring lines(cultivars) commonly cultivated in Central China were regarded as experimental materials to conduct 4×27NC Ⅱ cross design,and the grain characters of three-line hybrid were analyzed at genetic and correlation levels.[Result] Four characters of grain length,grain width,1 000-grain weight and length-to-width ratio play the leading role in additive gene effect;these four characters were simultaneously influenced by male parent and female parent,but the effect from male parent was relatively larger.The grain length,grain width,1 000-grain weight and length-to-width ratio all have high broad heritabilities(respectively 99.65%,98.31%,95.27% and 98.81%).Correlation analysis showed that grain length was positively correlated with 1 000-grain weight and length-to-width ratio at extremely significant level;1 000-grain weight was positively correlated with grain length and length-to-width ratio at extremely significant level,and was insignificantly correlated with grain width;grain width was negatively correlated with grain length and length-to-width ratio at extremely significant level.Path analysis showed that the direct path coefficients of grain length,grain width and 1 000-grain weight to length-to-width ratio were 0.624 6,-0.555 9 and-0.015 8,respectively.[Conclusion] This study systematically analyzed the effects of sterile line and restoring line on grain characters of hybrid rice,which provided theoretical basis for breeding high quality and yield hybrid rice.
【Fund】: 国家自然科学基金(305600731);; 国家科技支撑计划(2006BAD01A01);; 江西省重大科技创新项目;; 江西省科技攻关项目(200210100201)资助
【CateGory Index】: S511.21
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