数字农科院2.0

A new chromosome-scale genome of wild Brassica oleracea provides insights into the domestication of Brassica crops

文献类型： 外文期刊

作者： Ji, Gaoxiang;Long, Ying;Cai, Guangqin;Wang, Aihua;Yan, Guixin;Li, Hao;Gao, Guizhen;Xu, Kun;Huang, Qian;Chen, Biyun;Li, Lixia;Li, Feng;Nishio, Takeshi;Shen, Jinxiong;Wu, Xiaoming

作者机构：

关键词： Broccoli;cauliflower;crop domestication;pangenome;wild Brassica oleracea;WUSCHEL

期刊名称： JOURNAL OF EXPERIMENTAL BOTANY

ISSN： 0022-0957

年卷期： 2024 年

页码：

收录情况： SCIE（2024版）

摘要： The cultivated diploid Brassica oleracea is an important vegetable crop, but the genetic basis of its domestication remains largely unclear in the absence of high-quality reference genomes of wild B. oleracea. Here, we report the first chromosome-level assembly of the wild Brassica oleracea L. W03 genome (total genome size, 630.7 Mb; scaffold N50, 64.6 Mb). Using the newly assembled W03 genome, we constructed a gene-based B. oleracea pangenome and identified 29 744 core genes, 23 306 dispensable genes, and 1896 private genes. We re-sequenced 53 accessions, representing six potential wild B. oleracea progenitor species. The results of the population genomic analysis showed that the wild B. oleracea populations had the highest level of diversity and represents the most closely related population to modern-day horticultural B. oleracea. In addition, the WUSCHEL gene was found to play a decisive role in domestication and to be involved in cauliflower and broccoli curd formation. We also illustrate the loss of disease-resistance genes during selection for domestication. Our results provide new insights into the domestication of B. oleracea and will facilitate the future genetic improvement of Brassica crops. A new chromosome-level assembly of the wild Brassica oleracea W03 genome provides insights into the speciation of Brassica crops and identifies WUSCHEL as a key gene in domestication.

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