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The genome of Orychophragmus violaceus provides genomic insights into the evolution of Brassicaceaepolyploidizationandits distinct traits

引用

Plant Communications 2023年第2期4卷 77-92页

作者： Kang Zhang Yinqing Yang Xin Zhang Lingkui Zhang Yu Fu Zhongwei Guo Shumin Chen Jian Wu James C.Schnable Keke Yi Xiaowu Wang Feng Cheng Institute of Vegetables and Flowers Chinese Academy of Agricultural SciencesKey Laboratory of Biology and Genetic Improvement of Horticultural Crops of the Ministry of AgricultureSino-Dutch Joint Laboratory of Horticultural GenomicsBeijing 10008China Department of Agronomy and Horticulture University of NebraskaLincolnNE 68588USA Key Laboratory of Plant Nutrition and Fertilizer Ministry of AgricultureInstitute of Agricultural Resources and Regional PlanningChinese Academy of Agricultural SciencesBeijing 100081China

Orychophragmus violaceus,referred to as‘‘eryuelan’’(February orchid)in China,is an early-flowering ornamental *** high oil content and abundance of unsaturated fatty acids in *** seeds make it a potential high-quality oilseed ***,we generated a whole-genome assembly for *** using Nanopore and Hi-C sequencing *** assembled genome of *** was~1.3 Gb in size,with 12 pairs of *** investigation of ancestral genome evolution,we determined that the genome of *** experienced a tetraploidization event from a diploid progenitor with the translocated proto-Calepineae *** between the reconstructed subgenomes of *** identified indicators of subgenome dominance,indicating that subgenomes likely originated via *** was phylogenetically close to the Brassica genus,and tetraploidy in *** occurred approximately 8.57 million years ago,close in time to the whole-genome triplication of Brassica that likely arose via an intermediate tetraploid ***,the tetraploidization in Orychophragmus 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 ***,identification of multi-copy genes regulating the production of high-quality oil highlighted the contributions of both tetraploidization and tandem duplication to functional innovation in *** findings provide novel insights into the polyploidization evolution of plant species and will promote both functional genomic studies and domestication/breeding efforts in ***.

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

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