Sinapis genomes provide insights into whole-genome triplication and divergence patterns within tribe Brassiceae

• 全文链接

Sinapis基因组研究为芸苔属全基因组三倍性和分化模式提供了新的视角

关键词：

来源：

The Plant Journal

全文链接：

//agri.nais.net.cn/topic/downloadFile/736acaa4-e02e-4857-aa40-2b1d94594525

来源地址：

https://onlinelibrary.wiley.com/doi/10.1111/tpj.16043

资源所属：

蔬菜育种专题

类型：

学术文献

语种：

英语

原文发布日期：

2022-11-24

摘要：

Sinapis alba and Sinapis arvensis are mustard crops within the Brassiceae tribe of the Brassicaceae family, and represent an important genetic resource for crop improvement. We performed the de novo assembly of Brassica nigra, S. alba, and S. arvensis, and conducted comparative genomics to investigate the pattern of genomic evolution since an ancient whole-genome triplication event. Both Sinapis species retained evidence of the Brassiceae whole-genome triplication approximately 20.5 million years ago (Mya), with subgenome dominance observed in gene density, gene expression, and selective constraint. While S. alba diverged from the ancestor of Brassica and Raphanus at approximately 12.5 Mya, the divergence time of S. arvensis and B. nigra was approximately 6.5 Mya. S. arvensis and B. nigra had greater collinearity compared with their relationship to either Brassica rapa or Brassica oleracea. Two chromosomes of S. alba (Sal03 and Sal08) were completely collinear with two ancestral chromosomes proposed in the Ancestral Crucifer Karyotype (ACK) genomic block model, the first time this has been observed in the Brassiceae. These results are consistent with S. alba representing a relatively ancient lineage of the species evolved from the common ancestor of tribe Brassiceae, and suggest that the phylogeny of the Brassica and Sinapis genera requires some revision. Our study provides new insights into the genome evolution and phylogenetic relationships of Brassiceae and provides genomic information for genetic improvement of these plants.