Barrier to gene flow between two ecologically divergent Populus species, P. alba (white poplar) and P. tremula (European aspen): the role of ecology and life history in gene introgression.
Identifieur interne : 004101 ( Main/Exploration ); précédent : 004100; suivant : 004102Barrier to gene flow between two ecologically divergent Populus species, P. alba (white poplar) and P. tremula (European aspen): the role of ecology and life history in gene introgression.
Auteurs : C. Lexer [Royaume-Uni] ; M F Fay ; J A Joseph ; M-S Nica ; B. HeinzeSource :
- Molecular ecology [ 0962-1083 ] ; 2005.
Descripteurs français
- KwdFr :
- ADN des plantes (génétique), Autriche (MeSH), Densité de population (MeSH), Génétique des populations (MeSH), Géographie (MeSH), Haplotypes (MeSH), Hybridation génétique (MeSH), Plastes (génétique), Polymorphisme de restriction (MeSH), Populus (génétique), Répétitions microsatellites (génétique), Variation génétique (MeSH), Écologie (MeSH).
- MESH :
- Wicri :
- geographic : Autriche.
English descriptors
- KwdEn :
- Austria (MeSH), DNA, Plant (genetics), Ecology (MeSH), Genetic Variation (MeSH), Genetics, Population (MeSH), Geography (MeSH), Haplotypes (MeSH), Hybridization, Genetic (MeSH), Microsatellite Repeats (genetics), Plastids (genetics), Polymorphism, Restriction Fragment Length (MeSH), Population Density (MeSH), Populus (genetics).
- MESH :
- chemical , genetics : DNA, Plant.
- geographic : Austria.
- genetics : Microsatellite Repeats, Plastids, Populus.
- Ecology, Genetic Variation, Genetics, Population, Geography, Haplotypes, Hybridization, Genetic, Polymorphism, Restriction Fragment Length, Population Density.
Abstract
The renewed interest in the use of hybrid zones for studying speciation calls for the identification and study of hybrid zones across a wide range of organisms, especially in long-lived taxa for which it is often difficult to generate interpopulation variation through controlled crosses. Here, we report on the extent and direction of introgression between two members of the "model tree" genus Populus: Populus alba (white poplar) and Populus tremula (European aspen), across a large zone of sympatry located in the Danube valley. We genotyped 93 hybrid morphotypes and samples from four parental reference populations from within and outside the zone of sympatry for a genome-wide set of 20 nuclear microsatellites and eight plastid DNA restriction site polymorphisms. Our results indicate that introgression occurs preferentially from P. tremula to P. alba via P. tremula pollen. This unidirectional pattern is facilitated by high levels of pollen vs. seed dispersal in P. tremula (pollen/seed flow = 23.9) and by great ecological opportunity in the lowland floodplain forest in proximity to P. alba seed parents, which maintains gene flow in the direction of P. alba despite smaller effective population sizes (N(e)) in this species (P. alba N(e)c. 500-550; P. tremula N(e)c. 550-700). Our results indicate that hybrid zones will be valuable tools for studying the genetic architecture of the barrier to gene flow between these two ecologically divergent Populus species.
DOI: 10.1111/j.1365-294X.2005.02469.x
PubMed: 15773935
Affiliations:
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Here, we report on the extent and direction of introgression between two members of the "model tree" genus Populus: Populus alba (white poplar) and Populus tremula (European aspen), across a large zone of sympatry located in the Danube valley. We genotyped 93 hybrid morphotypes and samples from four parental reference populations from within and outside the zone of sympatry for a genome-wide set of 20 nuclear microsatellites and eight plastid DNA restriction site polymorphisms. Our results indicate that introgression occurs preferentially from P. tremula to P. alba via P. tremula pollen. This unidirectional pattern is facilitated by high levels of pollen vs. seed dispersal in P. tremula (pollen/seed flow = 23.9) and by great ecological opportunity in the lowland floodplain forest in proximity to P. alba seed parents, which maintains gene flow in the direction of P. alba despite smaller effective population sizes (N(e)) in this species (P. alba N(e)c. 500-550; P. tremula N(e)c. 550-700). Our results indicate that hybrid zones will be valuable tools for studying the genetic architecture of the barrier to gene flow between these two ecologically divergent Populus species.</div></front></TEI><pubmed><MedlineCitation Status="MEDLINE" Owner="NLM"><PMID Version="1">15773935</PMID><DateCompleted><Year>2006</Year><Month>01</Month><Day>06</Day></DateCompleted><DateRevised><Year>2008</Year><Month>11</Month><Day>21</Day></DateRevised><Article PubModel="Print"><Journal><ISSN IssnType="Print">0962-1083</ISSN><JournalIssue CitedMedium="Print"><Volume>14</Volume><Issue>4</Issue><PubDate><Year>2005</Year><Month>Apr</Month></PubDate></JournalIssue><Title>Molecular ecology</Title><ISOAbbreviation>Mol Ecol</ISOAbbreviation></Journal><ArticleTitle>Barrier to gene flow between two ecologically divergent Populus species, P. alba (white poplar) and P. tremula (European aspen): the role of ecology and life history in gene introgression.</ArticleTitle><Pagination><MedlinePgn>1045-57</MedlinePgn></Pagination><Abstract><AbstractText>The renewed interest in the use of hybrid zones for studying speciation calls for the identification and study of hybrid zones across a wide range of organisms, especially in long-lived taxa for which it is often difficult to generate interpopulation variation through controlled crosses. Here, we report on the extent and direction of introgression between two members of the "model tree" genus Populus: Populus alba (white poplar) and Populus tremula (European aspen), across a large zone of sympatry located in the Danube valley. We genotyped 93 hybrid morphotypes and samples from four parental reference populations from within and outside the zone of sympatry for a genome-wide set of 20 nuclear microsatellites and eight plastid DNA restriction site polymorphisms. Our results indicate that introgression occurs preferentially from P. tremula to P. alba via P. tremula pollen. This unidirectional pattern is facilitated by high levels of pollen vs. seed dispersal in P. tremula (pollen/seed flow = 23.9) and by great ecological opportunity in the lowland floodplain forest in proximity to P. alba seed parents, which maintains gene flow in the direction of P. alba despite smaller effective population sizes (N(e)) in this species (P. alba N(e)c. 500-550; P. tremula N(e)c. 550-700). 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Heinze</name><name sortKey="Joseph, J A" sort="Joseph, J A" uniqKey="Joseph J" first="J A" last="Joseph">J A Joseph</name><name sortKey="Nica, M S" sort="Nica, M S" uniqKey="Nica M" first="M-S" last="Nica">M-S Nica</name></noCountry><country name="Royaume-Uni"><noRegion><name sortKey="Lexer, C" sort="Lexer, C" uniqKey="Lexer C" first="C" last="Lexer">C. Lexer</name></noRegion></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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