Heterosis-associated genes confer high yield in super hybrid rice

文献类型： 外文期刊

第一作者： Lin, Tianzi

作者： Lin, Tianzi;Zhou, Cong;Chen, Gaoming;Yu, Jun;Wu, Wei;Ge, Yuwei;Liu, Xiaolan;Li, Jin;Jiang, Xingzhou;Tang, Weijie;Tian, Yunlu;Zhao, Zhigang;Wang, Chunming;Wan, Jianmin;Wan, Jianmin;Lin, Tianzi;Zhu, Chengsong;Zhou, Cong;Wang, Chunming;Zhou, Cong;Wang, Chunming;Zhou, Cong;Wang, Chunming

作者机构：

期刊名称：THEORETICAL AND APPLIED GENETICS （ 影响因子：5.699； 五年影响因子：5.565 ）

ISSN： 0040-5752

年卷期： 2020 年 133 卷 12 期

页码：

收录情况： SCI

摘要： Key message Heterosis QTLs, includingqSS7andqHD8,with dominance effects were identified through GBS and large-scale phenotyping of CSSLs and hybrid F(1)populations in a paddy field. Heterosis has contributed immensely to agricultural production, but its genetic basis is unclear. We evaluated dominance effects by creating two hybrid populations: a B-homo set with a homozygous background and heterozygous chromosomal segments and a B-heter set with a heterozygous background and homozygous segments. This was achieved by crossing a set of 156 backcrossed-derived chromosome segment substitution lines (CSSLs) with their recurrent parent (9311), the male parent of the first super-high-yield hybrid Liangyoupei9 (LYP9), and with the female parent (PA64s) of the hybrid. The CSSLs were subjected to a genotyping-by-sequencing analysis to develop a genetic map of segments introduced from the PA64s. We evaluated the heterotic effects on eight yield-related traits in the hybrid variety and F(1)populations in large-scale field experiments over 2 years. Using a linkage map consisting of high-density SNPs, we identified heterosis-associated genes in LYP9. Five candidate genes contributed to the high yield of LYP9, withqSS7andqHD8repeatedly detected in both B-hybrid populations. The heterozygous segments harboringqSS7andqHD8showed dominance effects that contributed to the heterosis of yield components in the hybrid rice variety Liangyoupei9.

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