Molecular phylogeny and divergence times of Astragalus section Hymenostegis: An analysis of a rapidly diversifying species group in Fabaceae

Scientific Reports
Ali BagheriFrank R Blattner

Abstract

The taxa of Astragalus section Hymenostegis are an important element of mountainous and steppe habitats in Southwest Asia. A phylogenetic hypothesis of sect. Hymenostegis has been obtained from nuclear ribosomal DNA internal transcribed spacer (ITS) and plastid ycf1 sequences of up to 303 individuals from 106 species, including all 89 taxa currently assigned to sect. Hymenostegis, 14 species of other Astragalus sections, and two species of Oxytropis and one Biserrula designated as outgroups. Bayesian phylogenetic inference and parsimony analyses reveal that three species from two other closely related sections group within sect. Hymenostegis, making the section paraphyletic. DNA sequence diversity is generally very low among Hymenostegis taxa, which is consistent with recent diversification of the section. We estimate that diversification in sect. Hymenostegis occurred in the middle to late Pleistocene, with many species arising only during the last one million years, when environmental conditions in the mountain regions of Southwest and Central Asia cycled repeatedly between dry and more humid conditions.

References

Nov 15, 2003·Molecular Phylogenetics and Evolution·I Alvarez, J F Wendel
Sep 1, 2004·Molecular Phylogenetics and Evolution·Frank R Blattner
Aug 16, 1968·Science·B Frenzel
Sep 3, 2010·BMC Biology·Alexei J Drummond, Marc A Suchard
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Feb 24, 2012·Systematic Biology·Fredrik RonquistJohn P Huelsenbeck
Apr 12, 2014·PLoS Computational Biology·Remco BouckaertAlexei J Drummond
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Mar 1, 1990·Evolution; International Journal of Organic Evolution·Matt LavinJeffrey D Palmer

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