Prediction of hybrid grain yield performances in Indica Rice (<Emphasis Type="Italic">Oryza sativa</Emphasis> L.) with effect-increasing loci |
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Authors: | Zha Renming Ling Yinghua Yang Zhenglin Zhao Fangming Zhong Bingqiang Xie Rong Sang Xianchun He Guanghua |
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Institution: | (1) Rice Research Institute, Key Laboratory of Biotechnology and Crop Quality Improvement, Ministry of Agriculture, Southwest University, Chongqing, 400716, China;(2) College of Agriculture, Guizhou University, Guiyang, 550025, China;(3) Rice and Sorghum Research Institute, Sichuan Academy of Agricultural Science, Luzhou, 646100, Sichuan, China |
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Abstract: | 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 F1 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 F1 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 F1 was large; (2) the correlations between F1 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 F1 traits (except grain weight per plant) derived from different environments were ideal, but worse for F1 traits derived from different parents; and (4) IL was more effective than TL and PL in predicting traits of F1 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. |
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Keywords: | Heterosis prediction Effect-increasing loci Genetic distance Grain yield Rice |
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