Genomic insights into historical improvement of heterotic groups during modern hybrid maize breeding

文献类型： 外文期刊

第一作者： Li, Chunhui

作者： Li, Chunhui;Guan, Honghui;Li, Yongxiang;Liu, Xuyang;Zhang, Dengfeng;Wang, Xiaoming;Shi, Yunsu;Song, Yanchun;Li, Yu;Wang, Tianyu;Jing, Xin;Jiao, Chengzhi;Li, Yaoyao;Wang, Haiyang;Wang, Baobao;Liu, Cheng;Xie, Xiaoqing;Zhao, Haiyan;Wang, Yanbo;Liu, Jingbao;Zhang, Panpan;Hu, Guanghui;Li, Guoliang;Li, Suiyan;Sun, Dequan;Ross-Ibarra, Jeffrey;Ross-Ibarra, Jeffrey;Ross-Ibarra, Jeffrey

作者机构：

期刊名称：NATURE PLANTS （ 影响因子：17.352； 五年影响因子：19.328 ）

ISSN： 2055-026X

年卷期： 2022 年 8 卷 7 期

页码：

收录情况： SCI

摘要： This study reports the genomic changes underlying the convergent and divergent agronomic improvement of the female and male heterotic groups during modern hybrid maize breeding, laying a foundation for the dissection and utilization of maize heterosis. Single-cross maize hybrids display superior heterosis and are produced from crossing two parental inbred lines belonging to genetically different heterotic groups. Here we assembled 1,604 historically utilized maize inbred lines belonging to various female heterotic groups (FHGs) and male heterotic groups (MHGs), and conducted phenotyping and genomic sequencing analyses. We found that the FHGs and MHGs have undergone both convergent and divergent changes for different sets of agronomic traits. Using genome-wide selection scans and association analyses, we identified a large number of candidate genes that contributed to the improvement of agronomic traits of the FHGs and MHGs. Moreover, we observed increased genetic differentiation between the FHGs and MHGs across the breeding eras, and we found a positive correlation between increasing heterozygosity levels in the differentiated genes and heterosis in hybrids. Furthermore, we validated the function of two selected genes and a differentiated gene. This study provides insights into the genomic basis of modern hybrid maize breeding.

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