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Repeated unidirectional introgression towards Populus balsamifera in contact zones of exotic and native poplars.
Institut de Recherche en Biologie Végétale, Université de Montréal, 4101 Sherbrooke Est, Montréal QC H1X 2B2, Canada. (Department of Biological Sciences, California State University Los Angeles, 5151 State University Drive, Los Angeles, CA 90032, USA)
Institut de Recherche en Biologie Végétale, Université de Montréal, 4101 Sherbrooke Est, Montréal QC H1X 2B2, Canada.
Institut de Recherche en Biologie Végétale, Université de Montréal, 4101 Sherbrooke Est, Montréal QC H1X 2B2, Canada. (Department of Ecology and Evolution, University of Lausanne, Biology Building, UNIL, CH-1015 Lausanne, Switzerland)
Ministère des Ressources naturelles et de la Faune du Québec, 2700 Einstein, Québec, QC G1P 3W8, Canada.
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2010 (English)In: Molecular Ecology, ISSN 0962-1083, E-ISSN 1365-294X, Vol. 19, no 1, 132-145 p.Article in journal (Refereed) Published
Abstract [en]

As the evolutionary significance of hybridization is largely dictated by its extent beyond the first generation, we broadly surveyed patterns of introgression across a sympatric zone of two native poplars (Populus balsamifera, Populus deltoides) in Quebec, Canada within which European exotic Populus nigra and its hybrids have been extensively planted since the 1800s. Single nucleotide polymorphisms (SNPs) that appeared fixed within each species were characterized by DNA-sequencing pools of pure individuals. Thirty-five of these diagnostic SNPs were employed in a high-throughput assay that genotyped 635 trees of different age classes, sampled from 15 sites with various degrees of anthropogenic disturbance. The degree of admixture within sampled trees was then assessed through Bayesian clustering of genotypes. Hybrids were present in seven of the populations, with 2.4% of all sampled trees showing spontaneous admixture. Sites with hybrids were significantly more disturbed than pure stands, while hybrids comprised both immature juveniles and trees of reproductive age. All three possible F1s were detected. Advanced-generation hybrids were consistently biased towards P. balsamifera regardless of whether hybridization had occurred with P. deltoides or P. nigra. Gene exchange between P. deltoides and P. nigra was not detected beyond the F1 generation; however, detection of a trihybrid demonstrates that even this apparent reproductive isolation does not necessarily result in an evolutionary dead end. Collectively, results demonstrate the natural fertility of hybrid poplars and suggest that introduced genes could potentially affect the genetic integrity of native trees, similar to that arising from introgression between natives.

Place, publisher, year, edition, pages
John Wiley & Sons, 2010. Vol. 19, no 1, 132-145 p.
National Category
Forest Science
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URN: urn:nbn:se:umu:diva-67093DOI: 10.1111/j.1365-294X.2009.04442.xPubMedID: 20002578OAI: oai:DiVA.org:umu-67093DiVA: diva2:610622
Available from: 2013-03-12 Created: 2013-03-12 Last updated: 2017-12-06Bibliographically approved

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