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Divergent selection and genetic introgression shape the genome landscape of heterosis in hybrid rice

文献类型： 外文期刊

作者： Lin, Zechuan 1 ; Qin, Peng 3 ; Zhang, Xuanwen 3 ; Fu, Chenjian 3 ; Deng, Hanchao 6 ; Fu, Xingxue 3 ; Huang, Zhen 3 ; Jian 1 ;

作者机构： 1.Peking Univ, Peking Tsinghua Ctr Life Sci, Sch Adv Agr Sci, Beijing 100871, Peoples R China

2.Peking Univ, Peking Tsinghua Ctr Life Sci, Sch Life Sci, State Key Lab Prot & Plant Gene Res, Beijing 100871, Peoples R China

3.Hunan Yahua Seed Sci Res Inst, Dept Rice Breeding, Changsha 410119, Peoples R China

4.Minist Agr & Rural Affairs, State Key Lab Hybrid Rice, Changsha 410119, Peoples R China

5.Minist Agr & Rural Affairs, Key Lab Southern Rice Innovat & Improvement, Changsha 410119, Peoples R China

6.Shenzhen Inst Mol Crop Design, Dept Mol Marker, Shenzhen 518107, Peoples R China

7.Shenzhen Agr Sci & Technol Promot Ctr, Dept Mol Marker, Shenzhen 518055, Peoples R China

8.China Agr Univ, Coll Agron & Biotechnol, Dept Crop Genom & Bioinformat, Beijing 100193, Peoples R China

9.Guangdong Acad Agr Sci, Rice Res Inst, Guangzhou 510640, Peoples R China

10.South China Normal Univ, Coll Life Sci, Guangdong Prov Key Lab Biotechnol Plant Dev, Guangzhou 510631, Peoples R China

关键词： hybrid rice; heterosis; divergent selection; genetic introgression

期刊名称：PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA （ 影响因子：11.205； 五年影响因子：12.291 ）

ISSN： 0027-8424

年卷期： 2020 年 117 卷 9 期

页码：

收录情况： SCI

摘要： The successful application of heterosis in hybrid rice has dramatically improved rice productivity, but the genetic mechanism for heterosis in the hybrid rice remains unclear. In this study, we generated two populations of rice F-1 hybrids with present-day commercial hybrid parents, genotyped the parents with 50k SNP chip and genome resequencing, and recorded the phenotype of similar to 2,000 hybrids at three field trials. By integrating these data with the collected genotypes of similar to 4,200 rice landraces and improved varieties that were reported previously, we found that the male and female parents have different levels of genome introgressions from other rice subpopulations, including indica, aus, and japonica, therefore shaping heterotic loci in the hybrids. Among the introgressed exogenous genome, we found that heterotic loci, including Ghd8/DTH8, Gn1a, and IPA1 existed inwild rice, but were significantly divergently selected among the rice subpopulations, suggesting these loci were subject to environmental adaptation. During modern rice hybrid breeding, heterotic loci were further selected by removing loci with negative effect and fixing loci with positive effect and pyramid breeding. Our results provide insight into the genetic basis underlying the heterosis of elite hybrid rice varieties, which could facilitate a better understanding of heterosis and rice hybrid breeding.

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