Extensive gene flow blurs phylogeographic but not phylogenetic signal in Olea europaea L.

Details

Serval ID
serval:BIB_CA8C64DDC796
Type
Article: article from journal or magazin.
Collection
Publications
Title
Extensive gene flow blurs phylogeographic but not phylogenetic signal in Olea europaea L.
Journal
TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik
Author(s)
Rubio de Casas R., Besnard G., Schönswetter P., Balaguer L., Vargas P.
ISSN
0040-5752 (Print)
ISSN-L
0040-5752
Publication state
Published
Issued date
08/2006
Peer-reviewed
Oui
Volume
113
Number
4
Pages
575-583
Language
english
Notes
Publication types: Journal Article ; Research Support, Non-U.S. Gov't
Publication Status: ppublish
Abstract
Genetic structure and evolutionary patterns of the wild olive tree (Olea europaea L.) were investigated with AFLP fingerprinting data at three geographic levels: (a) phylogenetic relationships of the six currently recognized subspecies in Eurasia and Africa; (b) lineage identification in subsp. europaea of the Mediterranean basin; and (c) phylogeography in the western Mediterranean. Two statistical approaches (Bayesian inference and analysis of molecular variance) were used to analyse the AFLP fingerprints. To determine the congruency and transferability of results across studies previous RAPD and ISSR data were analysed in a similar manner. Comparisons proved that qualitative results were mostly congruent but quantitative values differed, depending on the method of analysis. Neighbour-Joining analysis of AFLP phenotypes supported current classification of subspecies. At a Mediterranean scale no clear cut phylogeographic pattern was recovered, likely due to extensive gene flow between populations of subsp. europaea. Gene flow estimates calculated with conventional F-statistics showed that reproductive barriers separated neither populations nor lineages of O. europaea. Genetic divergence between eastern and western parts of the Mediterranean basin was observed only when geographical and population information were incorporated into the analyses through hierarchical analysis of molecular variance (AMOVA). Within the western Mediterranean, the highest genetic diversity was found in two regions: on both sides of the Strait of Gibraltar and in the Balearic archipelago. Additionally, long-lasting isolation of the northern-most populations of the Iberian Peninsula appeared to be responsible for a significant divergence.
Keywords
DNA Fingerprinting, Gene Flow, Genes, Plant, Genetic Markers, Geography, Mediterranean Region, Olea/classification, Olea/genetics, Phylogeny, Polymorphism, Genetic
Pubmed
Web of science
Open Access
Yes
Create date
19/03/2008 12:05
Last modification date
24/07/2023 16:39
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