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Variation in Linked Selection and Recombination Drive Genomic Divergence during Allopatric Speciation of European and American Aspens
Umea Univ, Dept Ecol & Environm Sci, Umea, SE, Sweden..
Umea Univ, Dept Plant Physiol, Umea Plant Sci Ctr, S-90187 Umea, SE, Sweden..
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Evolutionary Biology. Umea Univ, Dept Ecol & Environm Sci, Umea, SE, Sweden..
Umea Univ, Dept Ecol & Environm Sci, Umea, SE, Sweden..
2016 (English)In: Molecular biology and evolution, ISSN 0737-4038, E-ISSN 1537-1719, Vol. 33, no 7, 1754-1767 p.Article in journal (Refereed) PublishedText
Abstract [en]

Despite the global economic and ecological importance of forest trees, the genomic basis of differential adaptation and speciation in tree species is still poorly understood. Populus tremula and Populus tremuloides are two of the most widespread tree species in the Northern Hemisphere. Using whole-genome re-sequencing data of 24 P. tremula and 22 P. tremuloides individuals, we find that the two species diverged similar to 2.2-3.1 million years ago, coinciding with the severing of the Bering land bridge and the onset of dramatic climatic oscillations during the Pleistocene. Both species have experienced substantial population expansions following long-term declines after species divergence. We detect widespread and heterogeneous genomic differentiation between species, and in accordance with the expectation of allopatric speciation, coalescent simulations suggest that neutral evolutionary processes can account for most of the observed patterns of genetic differentiation. However, there is an excess of regions exhibiting extreme differentiation relative to those expected under demographic simulations, which is indicative of the action of natural selection. Overall genetic differentiation is negatively associated with recombination rate in both species, providing strong support for a role of linked selection in generating the heterogeneous genomic landscape of differentiation between species. Finally, we identify a number of candidate regions and genes that may have been subject to positive and/or balancing selection during the speciation process.

Place, publisher, year, edition, pages
2016. Vol. 33, no 7, 1754-1767 p.
Keyword [en]
Populus tremula, Populus tremuloides, whole-genome re-sequencing, demographic histories, heterogeneous genomic differentiation, linked selection, recombination
National Category
URN: urn:nbn:se:uu:diva-299706DOI: 10.1093/molbev/msw051ISI: 000378767100009PubMedID: 26983554OAI: oai:DiVA.org:uu-299706DiVA: diva2:950023
Swedish Research Council
Available from: 2016-07-26 Created: 2016-07-26 Last updated: 2016-07-26Bibliographically approved

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