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Massive postglacial gene flow between European white oaks uncovered genes underlying species barriers

Thibault Leroy, Quentin Rougemont, Jean-Luc Dupouey, Catherine Bodénès, Céline Lalanne, Caroline Belser, Karine Labadie, Grégoire Le Provost, Jean-Marc Aury, Antoine Kremer, Christophe Plomion
doi: https://doi.org/10.1101/246637
Thibault Leroy
1BIOGECO, INRA, Univ. Bordeaux, 33610 Cestas, France
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Quentin Rougemont
1BIOGECO, INRA, Univ. Bordeaux, 33610 Cestas, France
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Jean-Luc Dupouey
3INRA Université de Lorraine UMR 1137 ‘Ecologie et Ecophysiologie Forestières’, route d’Amance, 54280 Champenoux, France
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Catherine Bodénès
1BIOGECO, INRA, Univ. Bordeaux, 33610 Cestas, France
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Céline Lalanne
1BIOGECO, INRA, Univ. Bordeaux, 33610 Cestas, France
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Caroline Belser
4CEA · Institut de Biologie François Jacob, Genoscope, 2 rue Gaston Crémieux, 91057 Evry, France
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Karine Labadie
4CEA · Institut de Biologie François Jacob, Genoscope, 2 rue Gaston Crémieux, 91057 Evry, France
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Grégoire Le Provost
1BIOGECO, INRA, Univ. Bordeaux, 33610 Cestas, France
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Jean-Marc Aury
4CEA · Institut de Biologie François Jacob, Genoscope, 2 rue Gaston Crémieux, 91057 Evry, France
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Antoine Kremer
1BIOGECO, INRA, Univ. Bordeaux, 33610 Cestas, France
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  • For correspondence: antoine.kremer@inra.fr
Christophe Plomion
1BIOGECO, INRA, Univ. Bordeaux, 33610 Cestas, France
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Abstract

Oaks are dominant forest tree species widely distributed across the Northern Hemisphere, where they constitute natural resources of economic, ecological, social and historical value. Hybridization and adaptive introgression have long been thought to be major drivers of their ecological success. Thus, the maintenance of species barriers remains a key question, given the extent of interspecific gene flow. In this study, we scanned the genomes of four European white oak species for reproductive barriers. We identified the ecological and phylogenic relationships of these species and inferred a long-term strict isolation followed by a recent and extensive postglacial contact. Then, we made use of the tremendous genetic variation among these species (31 million SNPs) to identify genomic regions for reproductive isolation. A literature-based functional annotation of the underlying genes highlighted important functions driving the reproductive isolation between these sister species. These functions were consistent with their ecological preferences and included tolerance to biotic and abiotic constraints. This study holds important implications for the renewal of European forests under global warming.

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Posted May 01, 2018.
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Massive postglacial gene flow between European white oaks uncovered genes underlying species barriers
Thibault Leroy, Quentin Rougemont, Jean-Luc Dupouey, Catherine Bodénès, Céline Lalanne, Caroline Belser, Karine Labadie, Grégoire Le Provost, Jean-Marc Aury, Antoine Kremer, Christophe Plomion
bioRxiv 246637; doi: https://doi.org/10.1101/246637
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Massive postglacial gene flow between European white oaks uncovered genes underlying species barriers
Thibault Leroy, Quentin Rougemont, Jean-Luc Dupouey, Catherine Bodénès, Céline Lalanne, Caroline Belser, Karine Labadie, Grégoire Le Provost, Jean-Marc Aury, Antoine Kremer, Christophe Plomion
bioRxiv 246637; doi: https://doi.org/10.1101/246637

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