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The high-quality genome of Brassica napus cultivar 'ZS11' reveals the introgression history in semi-winter morphotype

Date:2017/10/12   Hits:  

Fengming Sun*, Guangyi Fan, Qiong Hu, Yongming Zhou, Mei Guan, Chaobo Tong, Jiana Li, Dezhi Du, Cunkou Qi, Liangcai Jiang, Weiqing Liu, Shunmou Huang, Wenbin Chen, Jingyin Yu, Desheng Mei, Jinling Meng, Peng Zeng, Jiaqin Shi, Kede Liu, Xi Wang, Xinfa Wang, Yan Long, Xinming Liang, Zhiyong Hu, Guodong Huang, Caihua Dong, He Zhang, Jun Li, Yaolei Zhang, Liangwei Li, Chengcheng Shi, Jiahao Wang, Simon Ming-Yuen Lee, Chunyun Guan, Xun Xu, Shengyi Liu, Xin Liu, Boulos Chalhoub*, Wei Hua*, Hanzhong Wang*
Pub Year: 2017
DOI: 10.1111/tpj.13669
Publication Name: The Plant Journal
Allotetraploid oilseed rape (Brassica napus L.) is an agriculturally important crop. Cultivation and breeding of B. napus by humans has resulted in numerous genetically diverse morphotypes with optimized agronomic traits and ecophysiological adaptation. To further understand the genetic basis of diversification and adaptation, we report a draft genome of an Asian semi-winter oilseed rape cultivar ‘ZS11’ and its comprehensive genomic comparison with the genomes of the winter-type cultivar ‘Darmor-bzh’ as well as two progenitors. The integrated BAC-to-BAC and whole-genome shotgun sequencing strategies were effective in the assembly of repetitive regions (especially young long terminal repeats) and resulted in a high-quality genome assembly of B. napus ‘ZS11’. Within a short evolutionary period (~6700 years ago), semi-winter-type ‘ZS11’ and the winter-type ‘Darmor-bzh’ maintained highly genomic collinearity. Even so, certain genetic differences were also detected in two morphotypes. Relative to ‘Darmor-bzh’, both two subgenomes of ‘ZS11’ are closely related to its progenitors, and the ‘ZS11’ genome harbored several specific segmental homoeologous exchanges (HEs). Furthermore, the semi-winter-type ‘ZS11’ underwent potential genomic introgressions with B. rapa (Ar). Some of these genetic differences were associated with key agronomic traits. A key gene of A03.FLC3 regulating vernalization-responsive flowering time in ‘ZS11’ was first experienced HE, and then underwent genomic introgression event with Ar, which potentially has led to genetic differences in controlling vernalization in the semi-winter types. Our observations improved our understanding of the genetic diversity of different B. napus morphotypes and the cultivation history of semi-winter oilseed rape in Asia.

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