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

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 ycf 1 sequences of up to 303 individua...

Full description

Saved in:
Bibliographic Details
Published in:Scientific reports 2017-10, Vol.7 (1), p.14033-9, Article 14033
Main Authors: Bagheri, Ali, Maassoumi, Ali Asghar, Rahiminejad, Mohammad Reza, Brassac, Jonathan, Blattner, Frank R.
Format: Article
Language:English
Subjects:
45/22
45/23
45/29
45/77
631/181/2480
631/449/2669
631/449/447/2312
Astragalus
Bayes Theorem
Bayesian analysis
Climate
DNA, Plant - chemistry
DNA, Ribosomal Spacer - chemistry
Environmental conditions
Fabaceae - classification
Humanities and Social Sciences
Mountain regions
multidisciplinary
Nucleotide sequence
Phylogenetics
Phylogeny
Pleistocene
Ribosomal DNA
Science
Science (multidisciplinary)
Spacer
Species
Species Specificity
Steppes
Taxa
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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 ycf 1 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.
ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-017-14614-3