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A plastome phylogeny of Rumex (Polygonaceae) illuminates the divergent evolutionary histories of docks and sorrels.
Molecular Phylogenetics and Evolution 2023 March 10
The genus Rumex L. (Polygonaceae) provides a unique system for investigating the evolutionary development of sex determination and molecular rate evolution. Historically, Rumex has been divided, both taxonomically and colloquially into two groups: 'docks' and 'sorrels'. A well-resolved phylogeny can help evaluate a genetic basis for this division. Here we present a plastome phylogeny for 34 species of Rumex, inferred using maximum likelihood criteria. The historical 'docks' (Rumex subgenus Rumex) were resolved as monophyletic. The historical 'sorrels' (Rumex subgenera Acetosa and Acetosella) were resolved together, though not monophyletic due to the inclusion of R. bucephalophorus (Rumex subgenus Platypodium). Emex is supported as its own subgenus within Rumex, instead of resolved as sister taxa. We found remarkably low nucleotide diversity among the docks, consistent with recent diversification in that group, especially as compared to the sorrels. Fossil calibration of the phylogeny suggested that the common ancestor for Rumex (including Emex) has origins in the lower Miocene (22.13 MYA). The sorrels appear to have subsequently diversified at a relatively constant rate. The origin of the docks, however, was placed in the upper Miocene, but with most speciation occurring in the Plio-Pleistocene.
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