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Genome sequencing sheds light on the contribution of structural variants to Brassica oleracea diversification

By Ning Guo, Shenyun Wang, Lei Gao, Yongming Liu, Mengmeng Duan, Guixiang Wang, Jingjing Li, Meng Yang, Mei Zong, Shuo Han, Yanzheng Pei, Theo Borm, Honghe Sun, Liming Miao, Di Liu, Fangwei Yu, Wei Zhang, Heliang Ji, Chaohui Zhu, Yong Xu, Guusje Bonnema, Jianbin Li, Zhangjun Fei, Fan Liu

Posted 15 Oct 2020
bioRxiv DOI: 10.1101/2020.10.15.340224

Brassica oleracea includes several morphologically diverse, economically important vegetable crops. Here we present high-quality chromosome-scale genome assemblies for two B. oleracea morphotypes, cauliflower and cabbage. Direct comparison of these two assemblies identifies ~120 K high-confidence structural variants (SVs). Population analysis of 271 B. oleracea accessions using these SVs clearly separates different morphotypes, suggesting the association of SVs with B. oleracea intraspecific divergence. Genes affected by SVs selected between cauliflower and cabbage are enriched with functions related to response to stress and stimulus and meristem and flower development. Furthermore, genes affected by selected SVs and involved in the switch from vegetative to generative growth that defines curd initiation, inflorescence meristem proliferation for curd formation, maintenance and enlargement, are identified, providing insights into the regulatory network of curd development. This study reveals the important roles of SVs in diversification of different morphotypes of B. oleracea, and the newly assembled genomes and the SVs provide rich resources for future research and breeding. ### Competing Interest Statement The authors have declared no competing interest.

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