Additive and Over-dominant Effects Resulting from Epistatic Loci Are the Primary Genetic Basis of Heterosis in Rice

doi:10.1111/j.1744-7909.2008.00807.x

J Integr Plant Biol. ›› 2009, Vol. 51 ›› Issue (4): 393-408.DOI: 10.1111/j.1744-7909.2008.00807.x

• Molecular Physiology • Previous Articles Next Articles

Additive and Over-dominant Effects Resulting from Epistatic Loci Are the Primary Genetic Basis of Heterosis in Rice

Xiaojin Luo^1,2,3,4, Yongcai Fu^1,2,3, Peijiang Zhang⁵, Shuang Wu^1,2,3, Feng Tian^1,2,3,Jiayong Liu^1,2,3, Zuofeng Zhu^1,2,3, Jinshui Yang ⁴and Chuanqing Sun^1,2,3*

¹Department of Plant Genetics and Breeding and State Key Laboratory of Plant Physiology and Biochemistry, China Agricultural University, Beijing 100193, China
²National Centre for Evaluation of Agricultural Wild Plant (Rice), Beijing 100193, China
³Beijing Key Laboratory of Crop Genetic Improvement and Genome of Ministry of Agriculture, Beijing 100193, China
⁴State Key Laboratory of Genetic Engineering, Morgan-Tan International Center for Life Sciences, School of Life Sciences, Fudan University, Shanghai 200433, China
⁵Institute of Rice Research, Anhui Academy of Agricultural Sciences, Hefei 230031, China

Received:2008-07-04 Accepted:2008-10-20 Published:2009-03-31
About author:^*Author for correspondence Tel/Fax: +86 10 6273 1811; E-mail: suncq@cau.edu.cn

Abstract

Abstract:

A set of 148 F₉ recombinant inbred lines (RILs) was developed from the cross of an indica cultivar 93-11 and japonica cultivar DT713, showing strong F1 heterosis. Subsequently, two backcross F₁ (BCF₁) populations were constructed by backcrossing these 148 RILs to two parents, 93-11 and DT713. These three related populations (281BCF₁ lines, 148 RILs) were phenotyped for six yield-related traits in two locations. Significant inbreeding depression was detected in the population of RILS and a high level of heterosis was observed in the two BCF₁ populations. A total of 42 main-effect quantitative trait loci (M-QTLs) and 109 epistatic effect QTL pairs (E-QTLs) were detected in the three related populations using the mixed model approach. By comparing the genetic effects of these QTLs detected in the RILs, BCF₁ performance and mid parental heterosis (H_MP), we found that, in both BCF₁ populations, the QTLs detected could be classified into two predominant types: additive and over dominant loci, which indicated that the additive and over-dominant effect were more important than complete or partially dominance for M-QTLs and E-QTLs. Further, we found that the E-QTLs detected collectively explained a larger portion of the total phenotypic variation than the M-QTLs in both RILs and BCF₁ populations. All of these results suggest that additive and over dominance resulting from epistatic loci might be the primary genetic basis of heterosis in rice.

Luo XJ, Fu YC, Zhang PJ, Wu S, Tian F, Liu JY, Zhu ZF, Yang JS, Sun CQ (2009) Additive and over-dominant effects resulting from epistatic loci are the primary genetic basis of heterosis in rice. J. Integr. Plant Biol. 51(4), 393–408.

Key words: additivity, epistasis, heterosis, over-dominance, quantitative trait locus.

Xiaojin Luo, Yongcai Fu, Peijiang Zhang, Shuang Wu, Feng Tian, , Jiayong Liu, Zuofeng Zhu, Jinshui Yang , and Chuanqing Sun. Additive and Over-dominant Effects Resulting from Epistatic Loci Are the Primary Genetic Basis of Heterosis in Rice[J]. J Integr Plant Biol., 2009, 51(4): 393-408.

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Additive and Over-dominant Effects Resulting from Epistatic Loci Are the Primary Genetic Basis of Heterosis in Rice

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