Genetic and morphological differentiation in Populus nigra L.: isolation by colonization or isolation by adaptation?
Identifieur interne : 000267 ( Ncbi/Merge ); précédent : 000266; suivant : 000268Genetic and morphological differentiation in Populus nigra L.: isolation by colonization or isolation by adaptation?
Auteurs : Jennifer Dewoody ; Harriet Trewin ; Gail TaylorSource :
- Molecular Ecology [ 0962-1083 ] ; 2015.
Abstract
Identifying processes underlying the genetic and morphological differences among populations is a central question of evolutionary biology. Forest trees typically contain high levels of neutral genetic variation, and genetic differences are often correlated with geographic distance between populations [isolation by distance (IBD)] or are due to historic vicariance events [isolation by colonization (IBC)]. In contrast, morphological differences are largely due to local adaptation. Here, we examined genetic (microsatellite) and morphological (from a common garden experiment) variation in
Url:
DOI: 10.1111/mec.13192
PubMed: 25857321
PubMed Central: 4692097
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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">Genetic and morphological differentiation in <italic>Populus nigra</italic> L.: isolation by colonization or isolation by adaptation?</title><author><name sortKey="Dewoody, Jennifer" sort="Dewoody, Jennifer" uniqKey="Dewoody J" first="Jennifer" last="Dewoody">Jennifer Dewoody</name></author><author><name sortKey="Trewin, Harriet" sort="Trewin, Harriet" uniqKey="Trewin H" first="Harriet" last="Trewin">Harriet Trewin</name></author><author><name sortKey="Taylor, Gail" sort="Taylor, Gail" uniqKey="Taylor G" first="Gail" last="Taylor">Gail Taylor</name></author></titleStmt><publicationStmt><idno type="wicri:source">PMC</idno><idno type="pmid">25857321</idno><idno type="pmc">4692097</idno><idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4692097</idno><idno type="RBID">PMC:4692097</idno><idno type="doi">10.1111/mec.13192</idno><date when="2015">2015</date><idno type="wicri:Area/Pmc/Corpus">000014</idno><idno type="wicri:explorRef" wicri:stream="Pmc" wicri:step="Corpus" wicri:corpus="PMC">000014</idno><idno type="wicri:Area/Pmc/Curation">000014</idno><idno type="wicri:explorRef" wicri:stream="Pmc" wicri:step="Curation">000014</idno><idno type="wicri:Area/Pmc/Checkpoint">000035</idno><idno type="wicri:explorRef" wicri:stream="Pmc" wicri:step="Checkpoint">000035</idno><idno type="wicri:Area/Ncbi/Merge">000267</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Genetic and morphological differentiation in <italic>Populus nigra</italic> L.: isolation by colonization or isolation by adaptation?</title><author><name sortKey="Dewoody, Jennifer" sort="Dewoody, Jennifer" uniqKey="Dewoody J" first="Jennifer" last="Dewoody">Jennifer Dewoody</name></author><author><name sortKey="Trewin, Harriet" sort="Trewin, Harriet" uniqKey="Trewin H" first="Harriet" last="Trewin">Harriet Trewin</name></author><author><name sortKey="Taylor, Gail" sort="Taylor, Gail" uniqKey="Taylor G" first="Gail" last="Taylor">Gail Taylor</name></author></analytic><series><title level="j">Molecular Ecology</title><idno type="ISSN">0962-1083</idno><idno type="eISSN">1365-294X</idno><imprint><date when="2015">2015</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><p>Identifying processes underlying the genetic and morphological differences among populations is a central question of evolutionary biology. Forest trees typically contain high levels of neutral genetic variation, and genetic differences are often correlated with geographic distance between populations [isolation by distance (IBD)] or are due to historic vicariance events [isolation by colonization (IBC)]. In contrast, morphological differences are largely due to local adaptation. Here, we examined genetic (microsatellite) and morphological (from a common garden experiment) variation in <italic>Populus nigra</italic> L., European black poplar, collected from 13 sites across western Europe and grown in a common garden in Belgium. Significant genetic differentiation was observed, with populations from France displaying greater admixture than the distinct Spanish and central European gene pools, consistent with previously described glacial refugia (IBC). Many quantitative traits displayed a bimodal distribution, approximately corresponding to small-leaf and large-leaf ecotypes. Examination of nine climatic variables revealed the sampling locations to have diverse climates, and although the correlation between morphological and climatic differences was significant, the pattern was not consistent with strict local adaptation. Partial Mantel tests based on multivariate summary statistics identified significant residual correlation in comparisons of small-leaf to large-leaf ecotypes, and within the small-leaf samples, but not within large-leaf ecotypes, indicating that variation within the small-leaf morphotype in particular may be adaptive. Some small-leaf populations experience climates very similar to those in large-leaf sites. We conclude that adaptive differentiation and persistent IBC acted in combination to produce the genetic and morphological patterns observed in <italic>P. nigra</italic>.</p></div></front><back><div1 type="bibliography"><listBibl><biblStruct><analytic><author><name sortKey="Antonovics, J" uniqKey="Antonovics J">J Antonovics</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Blenkinsop, S" uniqKey="Blenkinsop S">S Blenkinsop</name></author><author><name sortKey="Fowler, Hj" uniqKey="Fowler H">HJ Fowler</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Bock, Dg" uniqKey="Bock D">DG Bock</name></author><author><name sortKey="Andrew, Rl" uniqKey="Andrew R">RL Andrew</name></author><author><name sortKey="Rieseberg, L" uniqKey="Rieseberg L">L Rieseberg</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Brown, Ahd" uniqKey="Brown A">AHD 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<front><journal-meta><journal-id journal-id-type="nlm-ta">Mol Ecol</journal-id><journal-id journal-id-type="iso-abbrev">Mol. Ecol</journal-id><journal-id journal-id-type="publisher-id">mec</journal-id><journal-title-group><journal-title>Molecular Ecology</journal-title></journal-title-group><issn pub-type="ppub">0962-1083</issn><issn pub-type="epub">1365-294X</issn><publisher><publisher-name>Blackwell Publishing Ltd</publisher-name><publisher-loc>Oxford, UK</publisher-loc></publisher></journal-meta><article-meta><article-id pub-id-type="pmid">25857321</article-id><article-id pub-id-type="pmc">4692097</article-id><article-id pub-id-type="doi">10.1111/mec.13192</article-id><article-categories><subj-group subj-group-type="heading"><subject>Original Articles</subject></subj-group></article-categories><title-group><article-title>Genetic and morphological differentiation in <italic>Populus nigra</italic> L.: isolation by colonization or isolation by adaptation?</article-title></title-group><contrib-group><contrib contrib-type="author"><name><surname>DeWoody</surname><given-names>Jennifer</given-names></name><xref ref-type="author-notes" rid="fn1">1</xref></contrib><contrib contrib-type="author"><name><surname>Trewin</surname><given-names>Harriet</given-names></name><xref ref-type="author-notes" rid="fn2">2</xref></contrib><contrib contrib-type="author"><name><surname>Taylor</surname><given-names>Gail</given-names></name></contrib><aff><institution>Centre for Life Sciences, Unviersity of Southampton</institution><addr-line>Building 85, Highfield Campus, Southampton, SO17 1BJ, UK</addr-line></aff></contrib-group><author-notes><corresp id="cor1">Gail Taylor, Fax: +44 23 8059 5159; E-mail: <email>g.taylor@soton.ac.uk</email></corresp><fn id="fn1" fn-type="present-address"><label>1</label><p>Present address: USDA Forest Service, National Forest Genetics Lab, 2480 Carson Road, Placerville, CA 95667, USA</p></fn><fn id="fn2" fn-type="present-address"><label>2</label><p>Present address: Biotechnology & Biological Sciences Research Council, Polaris House, North Star Avenue, Swindon, Wiltshire, SN2 IUH, UK</p></fn><fn><p>The copyright line for this article was changed on 18 August, 2015 after original online publication.</p></fn><fn><p>G.T. and J.D. conceived and designed the experiment; H.T. collected morphological data; and J.D. collected genetic data, conducted analyses and drafted the manuscript.</p></fn></author-notes><pub-date pub-type="ppub"><month>6</month><year>2015</year></pub-date><pub-date pub-type="epub"><day>14</day><month>5</month><year>2015</year></pub-date><volume>24</volume><issue>11</issue><fpage>2641</fpage><lpage>2655</lpage><history><date date-type="received"><day>10</day><month>1</month><year>2014</year></date><date date-type="rev-recd"><day>26</day><month>3</month><year>2015</year></date><date date-type="accepted"><day>02</day><month>4</month><year>2015</year></date></history><permissions><copyright-statement>© 2015 The Authors. <italic>Molecular Ecology</italic> Published by John Wiley & Sons Ltd.</copyright-statement><copyright-year>2015</copyright-year><license license-type="open-access" xlink:href="http://creativecommons.org/licenses/by/4.0/"><license-p>This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.</license-p></license></permissions><abstract><p>Identifying processes underlying the genetic and morphological differences among populations is a central question of evolutionary biology. Forest trees typically contain high levels of neutral genetic variation, and genetic differences are often correlated with geographic distance between populations [isolation by distance (IBD)] or are due to historic vicariance events [isolation by colonization (IBC)]. In contrast, morphological differences are largely due to local adaptation. Here, we examined genetic (microsatellite) and morphological (from a common garden experiment) variation in <italic>Populus nigra</italic> L., European black poplar, collected from 13 sites across western Europe and grown in a common garden in Belgium. Significant genetic differentiation was observed, with populations from France displaying greater admixture than the distinct Spanish and central European gene pools, consistent with previously described glacial refugia (IBC). Many quantitative traits displayed a bimodal distribution, approximately corresponding to small-leaf and large-leaf ecotypes. Examination of nine climatic variables revealed the sampling locations to have diverse climates, and although the correlation between morphological and climatic differences was significant, the pattern was not consistent with strict local adaptation. Partial Mantel tests based on multivariate summary statistics identified significant residual correlation in comparisons of small-leaf to large-leaf ecotypes, and within the small-leaf samples, but not within large-leaf ecotypes, indicating that variation within the small-leaf morphotype in particular may be adaptive. Some small-leaf populations experience climates very similar to those in large-leaf sites. We conclude that adaptive differentiation and persistent IBC acted in combination to produce the genetic and morphological patterns observed in <italic>P. nigra</italic>.</p></abstract><kwd-group><kwd>biomass</kwd><kwd>common garden experiment</kwd><kwd>European black poplar</kwd><kwd>leaf size</kwd><kwd>microsatellites</kwd></kwd-group></article-meta></front></pmc><affiliations><list></list><tree><noCountry><name sortKey="Dewoody, Jennifer" sort="Dewoody, Jennifer" uniqKey="Dewoody J" first="Jennifer" last="Dewoody">Jennifer Dewoody</name><name sortKey="Taylor, Gail" sort="Taylor, Gail" uniqKey="Taylor G" first="Gail" last="Taylor">Gail Taylor</name><name sortKey="Trewin, Harriet" sort="Trewin, Harriet" uniqKey="Trewin H" first="Harriet" last="Trewin">Harriet Trewin</name></noCountry></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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