Cargando…

Two disjunct Pleistocene populations and anisotropic postglacial expansion shaped the current genetic structure of the relict plant Amborella trichopoda

Past climate fluctuations shaped the population dynamics of organisms in space and time, and have impacted their present intra-specific genetic structure. Demo-genetic modelling allows inferring the way past demographic and migration dynamics have determined this structure. Amborella trichopoda is a...

Descripción completa

Detalles Bibliográficos
Autores principales: Tournebize, Rémi, Manel, Stéphanie, Vigouroux, Yves, Munoz, François, de Kochko, Alexandre, Poncet, Valérie
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5562301/
https://www.ncbi.nlm.nih.gov/pubmed/28820899
http://dx.doi.org/10.1371/journal.pone.0183412
_version_ 1783257946108461056
author Tournebize, Rémi
Manel, Stéphanie
Vigouroux, Yves
Munoz, François
de Kochko, Alexandre
Poncet, Valérie
author_facet Tournebize, Rémi
Manel, Stéphanie
Vigouroux, Yves
Munoz, François
de Kochko, Alexandre
Poncet, Valérie
author_sort Tournebize, Rémi
collection PubMed
description Past climate fluctuations shaped the population dynamics of organisms in space and time, and have impacted their present intra-specific genetic structure. Demo-genetic modelling allows inferring the way past demographic and migration dynamics have determined this structure. Amborella trichopoda is an emblematic relict plant endemic to New Caledonia, widely distributed in the understory of non-ultramafic rainforests. We assessed the influence of the last glacial climates on the demographic history and the paleo-distribution of 12 Amborella populations covering the whole current distribution. We performed coalescent genetic modelling of these dynamics, based on both whole-genome resequencing and microsatellite genotyping data. We found that the two main genetic groups of Amborella were shaped by the divergence of two ancestral populations during the last glacial maximum. From 12,800 years BP, the South ancestral population has expanded 6.3-fold while the size of the North population has remained stable. Recent asymmetric gene flow between the groups further contributed to the phylogeographical pattern. Spatially explicit coalescent modelling allowed us to estimate the location of ancestral populations with good accuracy (< 22 km) and provided indications regarding the mid-elevation pathways that facilitated post-glacial expansion.
format Online
Article
Text
id pubmed-5562301
institution National Center for Biotechnology Information
language English
publishDate 2017
publisher Public Library of Science
record_format MEDLINE/PubMed
spelling pubmed-55623012017-08-25 Two disjunct Pleistocene populations and anisotropic postglacial expansion shaped the current genetic structure of the relict plant Amborella trichopoda Tournebize, Rémi Manel, Stéphanie Vigouroux, Yves Munoz, François de Kochko, Alexandre Poncet, Valérie PLoS One Research Article Past climate fluctuations shaped the population dynamics of organisms in space and time, and have impacted their present intra-specific genetic structure. Demo-genetic modelling allows inferring the way past demographic and migration dynamics have determined this structure. Amborella trichopoda is an emblematic relict plant endemic to New Caledonia, widely distributed in the understory of non-ultramafic rainforests. We assessed the influence of the last glacial climates on the demographic history and the paleo-distribution of 12 Amborella populations covering the whole current distribution. We performed coalescent genetic modelling of these dynamics, based on both whole-genome resequencing and microsatellite genotyping data. We found that the two main genetic groups of Amborella were shaped by the divergence of two ancestral populations during the last glacial maximum. From 12,800 years BP, the South ancestral population has expanded 6.3-fold while the size of the North population has remained stable. Recent asymmetric gene flow between the groups further contributed to the phylogeographical pattern. Spatially explicit coalescent modelling allowed us to estimate the location of ancestral populations with good accuracy (< 22 km) and provided indications regarding the mid-elevation pathways that facilitated post-glacial expansion. Public Library of Science 2017-08-18 /pmc/articles/PMC5562301/ /pubmed/28820899 http://dx.doi.org/10.1371/journal.pone.0183412 Text en © 2017 Tournebize et al http://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
spellingShingle Research Article
Tournebize, Rémi
Manel, Stéphanie
Vigouroux, Yves
Munoz, François
de Kochko, Alexandre
Poncet, Valérie
Two disjunct Pleistocene populations and anisotropic postglacial expansion shaped the current genetic structure of the relict plant Amborella trichopoda
title Two disjunct Pleistocene populations and anisotropic postglacial expansion shaped the current genetic structure of the relict plant Amborella trichopoda
title_full Two disjunct Pleistocene populations and anisotropic postglacial expansion shaped the current genetic structure of the relict plant Amborella trichopoda
title_fullStr Two disjunct Pleistocene populations and anisotropic postglacial expansion shaped the current genetic structure of the relict plant Amborella trichopoda
title_full_unstemmed Two disjunct Pleistocene populations and anisotropic postglacial expansion shaped the current genetic structure of the relict plant Amborella trichopoda
title_short Two disjunct Pleistocene populations and anisotropic postglacial expansion shaped the current genetic structure of the relict plant Amborella trichopoda
title_sort two disjunct pleistocene populations and anisotropic postglacial expansion shaped the current genetic structure of the relict plant amborella trichopoda
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5562301/
https://www.ncbi.nlm.nih.gov/pubmed/28820899
http://dx.doi.org/10.1371/journal.pone.0183412
work_keys_str_mv AT tournebizeremi twodisjunctpleistocenepopulationsandanisotropicpostglacialexpansionshapedthecurrentgeneticstructureoftherelictplantamborellatrichopoda
AT manelstephanie twodisjunctpleistocenepopulationsandanisotropicpostglacialexpansionshapedthecurrentgeneticstructureoftherelictplantamborellatrichopoda
AT vigourouxyves twodisjunctpleistocenepopulationsandanisotropicpostglacialexpansionshapedthecurrentgeneticstructureoftherelictplantamborellatrichopoda
AT munozfrancois twodisjunctpleistocenepopulationsandanisotropicpostglacialexpansionshapedthecurrentgeneticstructureoftherelictplantamborellatrichopoda
AT dekochkoalexandre twodisjunctpleistocenepopulationsandanisotropicpostglacialexpansionshapedthecurrentgeneticstructureoftherelictplantamborellatrichopoda
AT poncetvalerie twodisjunctpleistocenepopulationsandanisotropicpostglacialexpansionshapedthecurrentgeneticstructureoftherelictplantamborellatrichopoda