The genome of Orychophragmus violaceus provides genomic insights into the evolution of Brassicaceae polyploidization and its distinct traits

文献类型： 外文期刊

第一作者： Zhang, Kang

作者： Zhang, Kang;Yang, Yinqing;Zhang, Xin;Zhang, Lingkui;Fu, Yu;Guo, Zhongwei;Chen, Shumin;Wu, Jian;Wang, Xiaowu;Cheng, Feng;Schnable, James C.;Yi, Keke

作者机构：

关键词： Orychophragmus violaceus; eryuelan; genome assembly; polyploidization; subgenome differentiation; function innovation

期刊名称：PLANT COMMUNICATIONS （ 影响因子：10.5； 五年影响因子：10.5 ）

ISSN： 2590-3462

年卷期： 2023 年 4 卷 2 期

页码：

收录情况： SCI

摘要： Orychophragmus violaceus, referred to as "eryuelan"(February orchid) in China, is an early-flowering orna-mental plant. The high oil content and abundance of unsaturated fatty acids in O. violaceus seeds make it a potential high-quality oilseed crop. Here, we generated a whole-genome assembly for O. violaceus using Nanopore and Hi-C sequencing technologies. The assembled genome of O. violaceus was-1.3 Gb in size, with 12 pairs of chromosomes. Through investigation of ancestral genome evolution, we determined that the genome of O. violaceus experienced a tetraploidization event from a diploid progenitor with the translocated proto-Calepineae karyotype. Comparisons between the reconstructed subgenomes of O. violaceus identified indicators of subgenome dominance, indicating that subgenomes likely originated via allotetraploidy. O. violaceus was phylogenetically close to the Brassica genus, and tetraploidy in O. violaceus occurred approximately 8.57 million years ago, close in time to the whole-genome triplication of Brassica that likely arose via an intermediate tetraploid lineage. However, the tetraploidization in Orycho-phragmus was independent of the hexaploidization in Brassica, as evidenced by the results from detailed phylogenetic analyses and comparisons of the break and fusion points of ancestral genomic blocks. More-over, identification of multi-copy genes regulating the production of high-quality oil highlighted the contri-butions of both tetraploidization and tandem duplication to functional innovation in O. violaceus. These findings provide novel insights into the polyploidization evolution of plant species and will promote both functional genomic studies and domestication/breeding efforts in O. violaceus.

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