Prediction of hybrid grain yield performances in Indica Rice (Oryza sativa L.) with effect-increasing loci
文献类型: 外文期刊
作者: Zha Renming 2 ; Ling Yinghua 1 ; Yang Zhenglin 1 ; Zhao Fangming 1 ; Zhong Bingqiang 1 ; Xie Rong 3 ; Sang Xianchun 1 ; H 1 ;
作者机构: 1.Southwest Univ, Minist Agr, Key Lab Biotechnol & Crop Qual Improvement, Rice Res Inst, Chongqing 400716, Peoples R China
2.Guizhou Univ, Coll Agr, Guiyang 550025, Peoples R China
3.Sichuan Acad Agr Sci, Rice & Sorghum Res Inst, Luzhou 646100, Sichuan, Peoples R China
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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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.
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关键词:水稻;种质资源;抗瘟性;农艺性状




