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Adaptive Introgression Facilitates Adaptation to High Latitudes in European Aspen (Populus tremula L.)

Rendón Anaya, Martha and Wilson, Jonathan and Sveinsson, Saemundur and Fedorkov, Aleksey and Cottrell, Joan and Bailey, Mark E. S. and Runis, Dainis and Lexer, Christian and Jansson, Stefan and Robinson, Kathryn M. and Street, Nathaniel R. and Ingvarsson, Pär (2021). Adaptive Introgression Facilitates Adaptation to High Latitudes in European Aspen (Populus tremula L.). Molecular Biology and Evolution. 38 , 5034-5050
[Research article]

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Abstract

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 similar to 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.

Authors/Creators:Rendón Anaya, Martha and Wilson, Jonathan and Sveinsson, Saemundur and Fedorkov, Aleksey and Cottrell, Joan and Bailey, Mark E. S. and Runis, Dainis and Lexer, Christian and Jansson, Stefan and Robinson, Kathryn M. and Street, Nathaniel R. and Ingvarsson, Pär
Title:Adaptive Introgression Facilitates Adaptation to High Latitudes in European Aspen (Populus tremula L.)
Series Name/Journal:Molecular Biology and Evolution
Year of publishing :2021
Volume:38
Page range:5034-5050
Number of Pages:17
Publisher:OXFORD UNIV PRESS
ISSN:0737-4038
Language:English
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Evolutionary Biology
Keywords:adaptation, introgression, postglacial colonization, selective sweep, balancing selection
URN:NBN:urn:nbn:se:slu:epsilon-p-114445
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-114445
Additional ID:
Type of IDID
DOI10.1093/molbev/msab229
Web of Science (WoS)000715560700028
ID Code:26219
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Plant Biology and Forest Genetics (until 131231)
Deposited By: SLUpub Connector
Deposited On:26 Nov 2021 16:25
Metadata Last Modified:26 Nov 2021 16:31

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