数字农科院2.0

Insights into spinach domestication from genome sequences of two wild spinach progenitors, Spinacia turkestanica and Spinacia tetrandra

文献类型： 外文期刊

作者： She, Hongbing;Liu, Zhiyuan;Xu, Zhaosheng;Zhang, Helong;Wu, Jian;Wang, Xiaowu;Cheng, Feng;Charlesworth, Deborah;Qian, Wei

作者机构：

关键词： bottlenecks;domestication;evolution;pericentromeric region;wild spinach relatives

期刊名称： NEW PHYTOLOGIST

ISSN： 0028-646X

年卷期： 2024 年

页码：

收录情况： SCIE（2024版）

摘要： Cultivated spinach (Spinacia oleracea) is a dioecious species. We report high-quality genome sequences for its two closest wild relatives, Spinacia turkestanica and Spinacia tetrandra, which are also dioecious, and are used to study the genetics of spinach domestication. Using a combination of genomic approaches, we assembled genomes of both these species and analyzed them in comparison with the previously assembled S. oleracea genome. These species diverged c. 6.3 million years ago (Ma), while cultivated spinach split from S. turkestanica 0.8 Ma. In all three species, all six chromosomes include very large gene-poor, repeat-rich regions, which, in S. oleracea, are pericentromeric regions with very low recombination rates in both male and female genetic maps. We describe population genomic evidence that the similar regions in the wild species also recombine rarely. We characterized 282 structural variants (SVs) that have been selected during domestication. These regions include genes associated with leaf margin type and flowering time. We also describe evidence that the downy mildew resistance loci of cultivated spinach are derived from introgression from both wild spinach species. Collectively, this study reveals the genome architecture of spinach assemblies and highlights the importance of SVs during the domestication of cultivated spinach.

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