April 21, 2020  |  

Genome structure and evolution of Antirrhinum majus L.

Authors: Li, Miaomiao and Zhang, Dongfen and Gao, Qiang and Luo, Yingfeng and Zhang, Hui and Ma, Bin and Chen, Chunhai and Whibley, Annabel and Zhang, Yu'e and Cao, Yinghao and Li, Qun and Guo, Han and Li, Junhui and Song, Yanzhai and Zhang, Yue and Copsey, Lucy and Li, Yan and Li, Xiuxiu and Qi, Ming and Wang, Jiawei and Chen, Yan and Wang, Dan and Zhao, Jinyang and Liu, Guocheng and Wu, Bin and Yu, Lili and Xu, Chunyan and Li, Jiang and Zhao, Shancen and Zhang, Yijing and Hu, Songnian and Liang, Chengzhi and Yin, Ye and Coen, Enrico and Xue, Yongbiao

Snapdragon (Antirrhinum majus L.), a member of the Plantaginaceae family, is an important model for plant genetics and molecular studies on plant growth and development, transposon biology and self-incompatibility. Here we report a near-complete genome assembly of A. majus cultivar JI7 (A. majus cv.JI7) comprising 510?Megabases (Mb) of genomic sequence and containing 37,714 annotated protein-coding genes. Scaffolds covering 97.12% of the assembled genome were anchored on eight chromosomes. Comparative and evolutionary analyses revealed that a whole-genome duplication event occurred in the Plantaginaceae around 46-49 million years ago (Ma). We also uncovered the genetic architectures associated with complex traits such as flower asymmetry and self-incompatibility, identifying a unique duplication of TCP family genes dated to around 46-49 Ma and reconstructing a near-complete ?S-locus of roughly 2?Mb. The genome sequence obtained in this study not only provides a representative genome sequenced from the Plantaginaceae but also brings the popular plant model system of Antirrhinum into the genomic age.

Journal: Nature plants
DOI: 10.1038/s41477-018-0349-9
Year: 2019

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