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Causes and consequences of large clonal assemblies in a poplar hybrid zone

hal.structure.identifierDepartment of Forest Ecology and Genetics
hal.structure.identifierDepartment of Biology
dc.contributor.authorMACAYA-SANZ, David
hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
dc.contributor.authorHEUERTZ, Myriam
hal.structure.identifierUnit of Ecology and Evolution, Department of Biology
hal.structure.identifierDepartment of Animal and Plant Sciences [Sheffield]
dc.contributor.authorLINDTKE, Dorothea
hal.structure.identifierInstitute of Biosciences and Bioresources
dc.contributor.authorVENDRAMIN, Giovanni G.
hal.structure.identifierUnit of Ecology and Evolution, Department of Biology
hal.structure.identifierDepartment of Botany and Biodiversity Research, Faculty of Life Sciences
dc.contributor.authorLEXER, Christian
hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
hal.structure.identifierDepartment of Forest Ecology and Genetics
dc.contributor.authorGONZALEZ MARTINEZ, Santiago
dc.date.issued2016
dc.identifier.issn0962-1083
dc.description.abstractEnAsexual reproduction is a common and fundamental mode of reproduction in plants. Although persistence in adverse conditions underlies most known cases of clonal dominance, proximal genetic drivers remain unclear, in particular for populations dominated by a few large clones. In this study, we studied a clonal population of the riparian tree Populus alba in the Douro river basin (northwestern Iberian Peninsula) where it hybridizes with Populus tremula, a species that grows in highly contrasted ecological conditions. We used 73 nuclear microsatellites to test whether genomic background (species ancestry) is a relevant cause of clonal success, and to assess the evolutionary consequences of clonal dominance by a few genets. Additional genotyping-by-sequencing data were produced to estimate the age of the largest clones. We found that a few ancient (over a few thousand years old) and widespread genets dominate the population, both in terms of clone size and number of sexual offspring produced. Interestingly, large clones possessed two genomic regions introgressed from P. tremula, which may have favoured their spread under stressful environmental conditions. At the population level, the spread of large genets was accompanied by an overall ancient (>0.1 Myr) but soft decline of effective population size. Despite this decrease, and the high clonality and dominance of sexual reproduction by large clones, the Douro hybrid zone still displays considerable genetic diversity and low inbreeding. This suggests that even in extreme cases as in the Douro, asexual and sexual dominance of a few large, geographically extended individuals does not threaten population survival.
dc.language.isoen
dc.publisherWiley
dc.subjectreproduction asexuée
dc.subjectpopulus
dc.subjectinduction génétique
dc.subjectpéninsule ibérique
dc.subjectmicrosatellite
dc.subject.eniberian peninsula
dc.subject.enmicrosatellites
dc.title.enCauses and consequences of large clonal assemblies in a poplar hybrid zone
dc.typeArticle de revue
dc.identifier.doi10.1111/mec.13850
dc.subject.halSciences du Vivant [q-bio]
bordeaux.journalMolecular Ecology
bordeaux.page5330-5344
bordeaux.volume25
bordeaux.issue21
bordeaux.peerReviewedoui
hal.identifierhal-01594493
hal.version1
hal.popularnon
hal.audienceNon spécifiée
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-01594493v1
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