Genomic admixture analysis in european Populus spp. reveals unexpected patterns of reproductive isolation and mating
- Lexer, Christian Department of Biology, University of Fribourg, Switzerland
- Joseph, Jeffrey A. Royal Botanic Gardens Kew, UK
- Loo, Marcela van University of Applied Life Sciences, Vienna, Austria
- Barbará, Thelma Royal Botanic Gardens Kew, UK
- Heinze, Berthold Federal Research Centre for Forests, Vienna, Austria
- Bartha, Denes West-Hungarian University, Sopron, Hungary
- Castiglione, Stefano University of Salerno, Italy
- Fay, Michael F. Royal Botanic Gardens Kew, UK
- Buerkle, C. Alex University of Wyoming, USA
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02.08.2010
Published in:
- Genetics. - 2010, vol. 186, p. 699–712
English
Admixture between genetically divergent populations facilitates genomic studies of the mechanisms involved in adaptation, reproductive isolation and speciation, including mapping of the loci involved in these phenomena. Little is known about how pre- and postzygotic barriers will affect the prospects of 'admixture mapping' in wild species. We have studied 93 mapped genetic markers (microsatellites, indels, and sequence polymorphisms, ca. 60 000 data points) to address this topic in hybrid zones of Populus alba and P. tremula, two wide-spread, ecologically important forest trees. Using genotype and linkage information and recently developed analytical tools we show that (1) reproductive isolation between these species is much stronger than previously assumed but this cannot prevent the introgression of neutral or advantageous alleles, (2) unexpected genotypic gaps exist between recombinant hybrids and their parental taxa, (3) these conspicuous genotypic patterns are due to assortative mating and strong postzygotic barriers, rather than recent population history. We discuss possible evolutionary trajectories of hybrid lineages between these species and outline strategies for admixture mapping in hybrid zones between highly divergent populations. Datasets such as this one are still rare in studies of natural hybrid zones but should soon become more common as high throughput genotyping and resequencing become feasible in non-model species.
- Faculty
- Faculté des sciences et de médecine
- Department
- Département de Biologie
- Language
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- English
- Classification
- Biological sciences
- License
- License undefined
- Identifiers
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- RERO DOC 20525
- DOI 10.1534/genetics.110.118828
- Persistent URL
- https://folia.unifr.ch/unifr/documents/301589
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