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Adaptive Introgression Facilitates Adaptation to High Latitudes in European Aspen (Populus tremula L.)
Linnean Centre for Plant Biology, Department of Plant Biology, Uppsala BioCenter, Swedish University of Agricultural Science, Uppsala, Sweden.
Linnean Centre for Plant Biology, Department of Plant Biology, Uppsala BioCenter, Swedish University of Agricultural Science, Uppsala, Sweden.
Matis Ltd, Reykjavik, Iceland.
Institute of Biology, Komi Science Center, Russian Academy of Sciences, Syktyvkar, Russian Federation.
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2021 (English)In: Molecular biology and evolution, ISSN 0737-4038, E-ISSN 1537-1719, Vol. 38, no 11, p. 5034-5050Article in journal (Refereed) Published
Abstract [en]

Understanding local adaptation has become a key research area given the ongoing climate challenge and the concomitant requirement to conserve genetic resources. Perennial plants, such as forest trees, are good models to study local adaptation given their wide geographic distribution, largely outcrossing mating systems, and demographic histories. We evaluated signatures of local adaptation in European aspen (Populus tremula) across Europe by means of whole-genome resequencing of a collection of 411 individual trees. We dissected admixture patterns between aspen lineages and observed a strong genomic mosaicism in Scandinavian trees, evidencing different colonization trajectories into the peninsula from Russia, Central and Western Europe. As a consequence of the secondary contacts between populations after the last glacial maximum, we detected an adaptive introgression event in a genome region of ∼500 kb in chromosome 10, harboring a large-effect locus that has previously been shown to contribute to adaptation to the short growing seasons characteristic of Northern Scandinavia. Demographic simulations and ancestry inference suggest an Eastern origin—probably Russian—of the adaptive Nordic allele which nowadays is present in a homozygous state at the north of Scandinavia. The strength of introgression and positive selection signatures in this region is a unique feature in the genome. Furthermore, we detected signals of balancing selection, shared across regional populations, that highlight the importance of standing variation as a primary source of alleles that facilitate local adaptation. Our results, therefore, emphasize the importance of migration–selection balance underlying the genetic architecture of key adaptive quantitative traits.

Place, publisher, year, edition, pages
Oxford University Press, 2021. Vol. 38, no 11, p. 5034-5050
Keywords [en]
adaptation, balancing selection, introgression, postglacial colonization, selective sweep
National Category
Genetics Evolutionary Biology
Identifiers
URN: urn:nbn:se:umu:diva-189999DOI: 10.1093/molbev/msab229ISI: 000715560700028PubMedID: 34329481Scopus ID: 2-s2.0-85119599061OAI: oai:DiVA.org:umu-189999DiVA, id: diva2:1617654
Funder
Knut and Alice Wallenberg FoundationSwedish Research CouncilSwedish National Infrastructure for Computing (SNIC), 2017/7-219Swedish National Infrastructure for Computing (SNIC), 2018/3-552Swedish National Infrastructure for Computing (SNIC), 2019/3-597Swedish National Infrastructure for Computing (SNIC), 2020/5-621Available from: 2021-12-07 Created: 2021-12-07 Last updated: 2021-12-07Bibliographically approved

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Jansson, StefanRobinson, Kathryn M.Street, Nathaniel

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