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Original Article

A phylogenetic perspective on the influence of ecological attributes on selected species of Astragalus

, , ORCID Icon & ORCID Icon
Pages 105-113 | Received 27 Jul 2017, Accepted 22 Aug 2017, Published online: 12 Sep 2017
 

ABSTRACT

The use of phylogeny in ecology has gained attention due to its benefits in understanding biological diversity and adaptation processes. In this study, phylogenetic positions of 12 Astragalus taxa were evaluated by comparing with 419 Astragalus taxa sequences in a database. Additionally, the influence of ecological traits on morphology was assessed. Although the samples were grouped according to subgenera or sections they belong to, this division was not striking. The phylogenetic relationships of the nine endemic and three common Astragalus taxa based on nrDNA region sequences and morphological features as well as their interplay with the environment were examined. Furthermore, soil characteristics of the fields where each Astragalus taxon grows were determined. Analysis of the sequences revealed that the 12 taxa were grouped into three clades using the Bayesian Inference method. A cladogram of 431 Astragalus taxa showed that the samples were divided into ten major clades. Morphological traits were found to be correlated with soil properties, which could indicate adaptation to environmental conditions of these taxa.

RÉSUMÉ

La phylogénie est de plus en plus utilisée en écologie pour mieux comprendre la biodiversité et les processus adaptatifs. Dans cette étude, les positions phylogénétiques de 12 taxons d’Astragalus ont été évaluées par comparaison avec 419 séquences de taxons d’Astragalus d’une base de données. L’influence des traits écologiques sur la morphologie a aussi été déterminée. Bien que les échantillons aient été groupés selon le sous-genre ou la section, la séparation n’était pas claire. Les relations phylogénétiques des neuf taxons endémiques et des trois taxons communs d’Astragalus ont été examinées sur la base des séquences d’ADNnr et des caractéristiques morphologiques, ainsi que de leurs interactions avec l’environnement. De plus, les caractéristiques du sol des sites où poussent les taxons d’ Astragalus ont été déterminées. L’analyse des séquences a révélé que les 12 taxons étaient groupés en trois clades par la méthode d’inférence bayésienne. Le cladogramme des 431 taxons d’Astragalus a montré que les échantillons se divisaient en dix clades principaux. Les traits morphologiques étaient corrélés avec les propriétés du sol, ce qui pourrait indiquer une adaptation aux conditions environnementales.

Acknowledgement

We would like to thank Assistant Professor Dr. Tugba Gurkok for her critical review of the manuscript.

Disclosure statement

No potential conflict of interest was reported by the authors.

Supplementary material

The supplementary material for this article can be accessed here.

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