Subgenome parallel selection is associated with morphotype diversification and convergent crop domestication in Brassica rapa and Brassica oleracea

Feng Cheng, Rifei Sun, Xilin Hou, Hongkun Zheng, Fenglan Zhang, Yangyong Zhang, Bo Liu, Jianli Liang, Mu Zhuang, Yunxia Liu, Dongyuan Liu, Xiaobo Wang, Pingxia Li, Yumei Liu, Ke Lin, Johan Bucher, Ningwen Zhang, Yan Wang, Hui Wang, Jie DengYongcui Liao, Keyun Wei, Xueming Zhang, Lixia Fu, Yunyan Hu, Jisheng Liu, Chengcheng Cai, Shujiang Zhang, Shifan Zhang, Fei Li, Hui Zhang, Jifang Zhang, Ning Guo, Zhiyuan Liu, Jin Liu, Chao Sun, Yuan Ma, Haijiao Zhang, Yang Cui, Micheal R. Freeling, Theo Borm, Guusje Bonnema, Jian Wu, Xiaowu Wang*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

144 Citations (Scopus)

Abstract

Brassica species, including crops such as cabbage, turnip and oilseed, display enormous phenotypic variation. Brassica genomes have all undergone a whole-genome triplication (WGT) event with unknown effects on phenotype diversification. We resequenced 199 Brassica rapa and 119 Brassica oleracea accessions representing various morphotypes and identified signals of selection at the mesohexaploid subgenome level. For cabbage morphotypes with their typical leaf-heading trait, we identified four subgenome loci that show signs of parallel selection among subgenomes within B. rapa, as well as four such loci within B. oleracea. Fifteen subgenome loci are under selection and are shared by these two species. We also detected strong subgenome parallel selection linked to the domestication of the tuberous morphotypes, turnip (B. rapa) and kohlrabi (B. oleracea). Overall, we demonstrated that the mesohexaploidization of the two Brassica genomes contributed to their diversification into heading and tuber-forming morphotypes through convergent subgenome parallel selection of paralogous genes.

Original languageEnglish
Pages (from-to)1218-1224
JournalNature Genetics
Volume48
Issue number10
DOIs
Publication statusPublished - 2016

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