当前位置： SCI文献检索 > MOLECULAR PHYLOGENETICS AND EVOLUTION期刊下所有文献 > The intraspecific genetic variability of siliceous and calcareous Gentiana species is shaped by contrasting demographic and re-colonization processes.

The intraspecific genetic variability of siliceous and calcareous Gentiana species is shaped by contrasting demographic and re-colonization processes.

Abstract：

:The Ciminalis section of Gentiana comprises seven species, two of them growing on siliceous substrates (G. alpina and G. acaulis), the other ones being calcareous taxa (G. clusii, G. angustifolia, G. ligustica, G. occidentalis and G. dinarica). A total of 515 individuals from 183 populations over the entire Ciminalis distribution range was analyzed using four chloroplast loci (trnH-psbA, matK, rpoB and rpoC1) and the nuclear ribosomal marker ITS2. The siliceous species display only two chloroplast haplotypes each and are both characterized by patterns of range expansions all over the Alps. Conversely, the calcareous species are on average more diverse (two to 13 haplotypes per species) with strong patterns of local structuring. We suggest that the occurrence of many calcareous refugia at the periphery of the Alps must have led to local adaptation and morphological diversification, and helped preserving intraspecific diversities during the last glaciations for the associated taxa. ITS2 was more efficient in delineating species boundaries than the chloroplast markers for which several haplotypes are shared among species. This might be either due to chloroplast capture among species and/or to recent divergence. Species adapted to the same substrate are generally only distantly related when they co-occur in the same place. For both types of markers, G. clusii is found genetically distant from all other species.

journal_name

Mol Phylogenet Evol

journal_title

Molecular phylogenetics and evolution

authors

Christe C,Caetano S,Aeschimann D,Kropf M,Diadema K,Naciri Y

doi

10.1016/j.ympev.2013.09.022

subject

Has Abstract

pub_date

2014-01-01 00:00:00

pages

323-36

eissn

1055-7903

issn

1095-9513

pii

S1055-7903(13)00380-1

journal_volume

70

pub_type

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