Extensive pollen flow in two ecologically contrasting populations of Populus trichocarpa.
Identifieur interne : 003715 ( Main/Curation ); précédent : 003714; suivant : 003716Extensive pollen flow in two ecologically contrasting populations of Populus trichocarpa.
Auteurs : G T Slavov [États-Unis] ; S. Leonardi ; J. Burczyk ; W T Adams ; S H Strauss ; S P DifazioSource :
- Molecular ecology [ 1365-294X ] ; 2009.
Descripteurs français
- KwdFr :
- MESH :
English descriptors
- KwdEn :
- MESH :
- chemical , genetics : DNA, Plant.
- geographic : Oregon.
- genetics : Pollen, Populus.
- Ecosystem, Gene Flow, Genetics, Population, Genotype, Likelihood Functions, Microsatellite Repeats, Models, Biological, Pollination.
Abstract
Pollen-mediated gene flow was measured in two populations of black cottonwood using direct (paternity analysis) and indirect (correlated paternity) methods. The Marchel site was an area with an approximate radius of 250 m in a large continuous stand growing in a mesic habitat in western Oregon. In contrast, the Vinson site was an area with a radius of approximately 10 km and consisted of small, disjunct and isolated stands in the high desert of eastern Oregon. Pollen immigration was extensive in both populations, and was higher in the Marchel site (0.54 +/- 0.02) than in the substantially larger and more isolated Vinson site (0.32 +/- 0.02). Pollen pool differentiation among mothers was approximately five times stronger in the Vinson population (Phi FT = 0.253, N = 27 mothers) than in the Marchel population (Phi FT = 0.052, N = 5 mothers). Pollen dispersal was modelled using a mixed dispersal curve that incorporated pollen immigration. Predicted pollination frequencies generated based on this curve were substantially more accurate than those based on the widely used exponential power dispersal curve. Male neighbourhood sizes (sensu Wright 1946) estimated using paternity analysis and pollen pool differentiation were remarkably similar. They were three to five times smaller in the Vinson population, which reflected the substantial ecological and demographic differences between the two populations. When the same mathematical function was used, applying direct and indirect methods resulted in similar pollen dispersal curves, thus confirming the value of indirect methods as a viable lower-cost alternative to paternity analysis.
DOI: 10.1111/j.1365-294X.2008.04016.x
PubMed: 19076277
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pubmed:19076277Le document en format XML
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<wicri:regionArea>Department of Biology, West Virginia University, Morgantown, WV 26506-6057</wicri:regionArea>
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<author><name sortKey="Leonardi, S" sort="Leonardi, S" uniqKey="Leonardi S" first="S" last="Leonardi">S. Leonardi</name>
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<author><name sortKey="Burczyk, J" sort="Burczyk, J" uniqKey="Burczyk J" first="J" last="Burczyk">J. Burczyk</name>
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<author><name sortKey="Burczyk, J" sort="Burczyk, J" uniqKey="Burczyk J" first="J" last="Burczyk">J. Burczyk</name>
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<term>Ecosystem (MeSH)</term>
<term>Gene Flow (MeSH)</term>
<term>Genetics, Population (MeSH)</term>
<term>Genotype (MeSH)</term>
<term>Likelihood Functions (MeSH)</term>
<term>Microsatellite Repeats (MeSH)</term>
<term>Models, Biological (MeSH)</term>
<term>Oregon (MeSH)</term>
<term>Pollen (genetics)</term>
<term>Pollination (MeSH)</term>
<term>Populus (genetics)</term>
</keywords>
<keywords scheme="KwdFr" xml:lang="fr"><term>ADN des plantes (génétique)</term>
<term>Flux des gènes (MeSH)</term>
<term>Fonctions de vraisemblance (MeSH)</term>
<term>Génotype (MeSH)</term>
<term>Génétique des populations (MeSH)</term>
<term>Modèles biologiques (MeSH)</term>
<term>Orégon (MeSH)</term>
<term>Pollen (génétique)</term>
<term>Pollinisation (MeSH)</term>
<term>Populus (génétique)</term>
<term>Répétitions microsatellites (MeSH)</term>
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<keywords scheme="MESH" qualifier="genetics" xml:lang="en"><term>Pollen</term>
<term>Populus</term>
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<term>Pollen</term>
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<term>Genetics, Population</term>
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<term>Models, Biological</term>
<term>Pollination</term>
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<term>Fonctions de vraisemblance</term>
<term>Génotype</term>
<term>Génétique des populations</term>
<term>Modèles biologiques</term>
<term>Orégon</term>
<term>Pollinisation</term>
<term>Répétitions microsatellites</term>
<term>Écosystème</term>
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<front><div type="abstract" xml:lang="en">Pollen-mediated gene flow was measured in two populations of black cottonwood using direct (paternity analysis) and indirect (correlated paternity) methods. The Marchel site was an area with an approximate radius of 250 m in a large continuous stand growing in a mesic habitat in western Oregon. In contrast, the Vinson site was an area with a radius of approximately 10 km and consisted of small, disjunct and isolated stands in the high desert of eastern Oregon. Pollen immigration was extensive in both populations, and was higher in the Marchel site (0.54 +/- 0.02) than in the substantially larger and more isolated Vinson site (0.32 +/- 0.02). Pollen pool differentiation among mothers was approximately five times stronger in the Vinson population (Phi FT = 0.253, N = 27 mothers) than in the Marchel population (Phi FT = 0.052, N = 5 mothers). Pollen dispersal was modelled using a mixed dispersal curve that incorporated pollen immigration. Predicted pollination frequencies generated based on this curve were substantially more accurate than those based on the widely used exponential power dispersal curve. Male neighbourhood sizes (sensu Wright 1946) estimated using paternity analysis and pollen pool differentiation were remarkably similar. They were three to five times smaller in the Vinson population, which reflected the substantial ecological and demographic differences between the two populations. When the same mathematical function was used, applying direct and indirect methods resulted in similar pollen dispersal curves, thus confirming the value of indirect methods as a viable lower-cost alternative to paternity analysis.</div>
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<Abstract><AbstractText>Pollen-mediated gene flow was measured in two populations of black cottonwood using direct (paternity analysis) and indirect (correlated paternity) methods. The Marchel site was an area with an approximate radius of 250 m in a large continuous stand growing in a mesic habitat in western Oregon. In contrast, the Vinson site was an area with a radius of approximately 10 km and consisted of small, disjunct and isolated stands in the high desert of eastern Oregon. Pollen immigration was extensive in both populations, and was higher in the Marchel site (0.54 +/- 0.02) than in the substantially larger and more isolated Vinson site (0.32 +/- 0.02). Pollen pool differentiation among mothers was approximately five times stronger in the Vinson population (Phi FT = 0.253, N = 27 mothers) than in the Marchel population (Phi FT = 0.052, N = 5 mothers). Pollen dispersal was modelled using a mixed dispersal curve that incorporated pollen immigration. Predicted pollination frequencies generated based on this curve were substantially more accurate than those based on the widely used exponential power dispersal curve. Male neighbourhood sizes (sensu Wright 1946) estimated using paternity analysis and pollen pool differentiation were remarkably similar. They were three to five times smaller in the Vinson population, which reflected the substantial ecological and demographic differences between the two populations. When the same mathematical function was used, applying direct and indirect methods resulted in similar pollen dispersal curves, thus confirming the value of indirect methods as a viable lower-cost alternative to paternity analysis.</AbstractText>
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