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Genomic analysis of hybrid rice varieties reveals numerous superior alleles that contribute to heterosis

文献类型: 外文期刊

作者: Huang, Xuehui 1 ; Yang, Shihua; Gong, Junyi; Zhao, Yan 1 ; Feng, Qi 1 ; Gong, Hao 1 ; Li, Wenjun 1 ; Zhan, Qilin 1 ; C 1 ;

作者机构: 1.Chinese Acad Sci, Collaborat Innovat Ctr Genet & Dev, Shanghai Inst Biol Sci, Inst Plant Physiol & Ecol,Natl Ctr Gene Res, Shanghai 200233, Peoples R China

2.Chinese Acad Sci, Collaborat Innovat Ctr Genet & Dev, Shanghai Inst Biol Sci, Inst

关键词: CYTOPLASMIC MALE-STERILITY;WIDE ASSOCIATION;UNRELATED INDIVIDUALS;RESISTANCE GENES;CULTIVATED RICE;FLOWERING TIME;GRAIN WIDTH;ARABIDOPSIS;YIELD;DOMINANCE

期刊名称:NATURE COMMUNICATIONS ( 影响因子:14.919; 五年影响因子:15.805 )

ISSN:

年卷期:

页码:

收录情况: SCI

摘要: Exploitation of heterosis is one of the most important applications of genetics in agriculture. However, the genetic mechanisms of heterosis are only partly understood, and a global view of heterosis from a representative number of hybrid combinations is lacking. Here we develop an integrated genomic approach to construct a genome map for 1,495 elite hybrid rice varieties and their inbred parental lines. We investigate 38 agronomic traits and identify 130 associated loci. In-depth analyses of the effects of heterozygous genotypes reveal that there are only a few loci with strong overdominance effects in hybrids, but a strong correlation is observed between the yield and the number of superior alleles. While most parental inbred lines have only a small number of superior alleles, high-yielding hybrid varieties have several. We conclude that the accumulation of numerous rare superior alleles with positive dominance is an important contributor to the heterotic phenomena.

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