Widespread ancient whole-genome duplications in Malpighiales coincide with Eocene global climatic upheaval

The New Phytologist
Liming CaiCharles C Davis

Abstract

Whole-genome duplications (WGDs) are widespread and prevalent in vascular plants and frequently coincide with major episodes of global and climatic upheaval, including the mass extinction at the Cretaceous-Tertiary boundary (c. 65 Ma) and during more recent periods of global aridification in the Miocene (c. 10-5 Ma). Here, we explore WGDs in the diverse flowering plant clade Malpighiales. Using transcriptomes and complete genomes from 42 species, we applied a multipronged phylogenomic pipeline to identify, locate, and determine the age of WGDs in Malpighiales using three means of inference: distributions of synonymous substitutions per synonymous site (Ks ) among paralogs, phylogenomic (gene tree) reconciliation, and a likelihood-based gene-count method. We conservatively identify 22 ancient WGDs, widely distributed across Malpighiales subclades. Importantly, these events are clustered around the Eocene-Paleocene transition (c. 54 Ma), during which time the planet was warmer and wetter than any period in the Cenozoic. These results establish that the Eocene Climatic Optimum likely represents a previously unrecognized period of prolific WGDs in plants, and lends further support to the hypothesis that polyploidization promotes ad...Continue Reading

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Citations

Nov 30, 2018·The New Phytologist·Emily B Sessa
Nov 30, 2019·Plant Cell Reports·Miguel GaravelloPablo Aleza
Aug 21, 2020·American Journal of Botany·Lorenzo Carretero-Paulet, Yves Van de Peer
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Jul 24, 2021·The Plant Genome·Zirlane Portugal CostaMaria Lucia Carneiro Vieira

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