Genomic evidence for rediploidization and adaptive evolution following the whole-genome triplication
文献类型： 外文期刊
作者： Feng X.;Chen Q.;Wu W.;Wang J.;Li G.;Xu S.;Shao S.;Liu M.;Zhong C.;Wu C.-I.;Shi S.;He Z.
作者机构：
关键词： （2-0-2）
期刊名称： Nature Communications
ISSN： 2041-1723
年卷期： 2024 年 15 卷 1 期
页码：
收录情况： SCIE（2024版）
摘要： Whole-genome duplication (WGD), or polyploidy, events are widespread and significant in the evolutionary history of angiosperms. However, empirical evidence for rediploidization, the major process where polyploids give rise to diploid descendants, is still lacking at the genomic level. Here we present chromosome-scale genomes of the mangrove tree Sonneratia alba and the related inland plant Lagerstroemia speciosa. Their common ancestor has experienced a whole-genome triplication (WGT) approximately 64 million years ago coinciding with a period of dramatic global climate change. Sonneratia, adapting mangrove habitats, experienced extensive chromosome rearrangements post-WGT. We observe the WGT retentions display sequence and expression divergence, suggesting potential neo- and sub-functionalization. Strong selection acting on three-copy retentions indicates adaptive value in response to new environments. To elucidate the role of ploidy changes in genome evolution, we improve a model of the polyploidization–rediploidization process based on genomic evidence, contributing to the understanding of adaptive evolution during climate change. © The Author(s) 2024.
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