Prediction of hybrid grain yield performances in Indica Rice (Oryza sativa L.) with effect-increasing loci

文献类型： 外文期刊

第一作者： Ling Yinghua

作者： Ling Yinghua;Yang Zhenglin;Zhao Fangming;Zhong Bingqiang;Sang Xianchun;He Guanghua;Zha Renming;Xie Rong

作者机构：

关键词： genetic distance;grain yield;rice

期刊名称：MOLECULAR BREEDING （ 影响因子：2.589； 五年影响因子：2.75 ）

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年卷期：

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收录情况： SCI

摘要： One hundred and fifty-one rice hybrids produced in two sets of half-dialell crosses and their parents (13 cytoplasmic male sterile lines and 19 restorers) were used to predict the F performances of seven yield traits through the parental genetic distances (GD) based on SSR markers. The positive loci (PL) and effect-increasing loci (IL), which were screened from SSR polymorphic loci by the F traits of 32 parents, together with total loci (TL), were utilized to estimate parental GD and the models were found to predict the traits of hybrids derived from different parents, fixed parents, and different environments, respectively. The results were as follows: (1) 550 polymorphic loci were detected from 174 SSR markers: a dendrogram based on these loci could separate all the sterile and restorer lines used in the present study, which indicated that parental genetic diversity of F was large; (2) the correlations between F traits and parental GDs based on IL ranged from 0.61 to 0.87 with a mean of 0.76, and they were higher than those on TL or on PL; (3) predictions based on IL for F traits (except grain weight per plant) derived from different environments were ideal, but worse for F traits derived from different parents; and (4) IL was more effective than TL and PL in predicting traits of F with fixed parents, and predictions for fixed restorer combinations were more effective than those for fixed sterile line combinations. These results should facilitate molecular prediction for hybrid yield and other traits by means of both elite sterile and restorer lines.

分类号： Q94

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