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Selective Sweeps Lead to Evolutionary Success in an Amazonian Hyperdominant Palm

Despite the global importance of tropical ecosystems, few studies have identified how natural selection has shaped their megadiversity. Here, we test for the role of adaptation in the evolutionary success of the widespread, highly abundant Neotropical palm Mauritia flexuosa. We used a genome scan fr...

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Autores principales: Melo, Warita A., Vieira, Lucas D., Novaes, Evandro, Bacon, Christine D., Collevatti, Rosane G.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Frontiers Media S.A. 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7786001/
https://www.ncbi.nlm.nih.gov/pubmed/33424928
http://dx.doi.org/10.3389/fgene.2020.596662
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author Melo, Warita A.
Vieira, Lucas D.
Novaes, Evandro
Bacon, Christine D.
Collevatti, Rosane G.
author_facet Melo, Warita A.
Vieira, Lucas D.
Novaes, Evandro
Bacon, Christine D.
Collevatti, Rosane G.
author_sort Melo, Warita A.
collection PubMed
description Despite the global importance of tropical ecosystems, few studies have identified how natural selection has shaped their megadiversity. Here, we test for the role of adaptation in the evolutionary success of the widespread, highly abundant Neotropical palm Mauritia flexuosa. We used a genome scan framework, sampling 16,262 single-nucleotide polymorphisms (SNPs) with target sequence capture in 264 individuals from 22 populations in rainforest and savanna ecosystems. We identified outlier loci as well as signal of adaptation using Bayesian correlations of allele frequency with environmental variables and detected both selective sweeps and genetic hitchhiking events. Functional annotation of SNPs with selection footprints identified loci affecting genes related to adaptation to environmental stress, plant development, and primary metabolic processes. The strong differences in climatic and soil variables between ecosystems matched the high differentiation and low admixture in population Bayesian clustering. Further, we found only small differences in allele frequency distribution in loci putatively under selection among widespread populations from different ecosystems, with fixation of a single allele in most populations. Taken together, our results indicate that adaptive selective sweeps related to environmental stress shaped the spatial pattern of genetic diversity in M. flexuosa, leading to high similarity in allele frequency among populations from different ecosystems.
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spelling pubmed-77860012021-01-07 Selective Sweeps Lead to Evolutionary Success in an Amazonian Hyperdominant Palm Melo, Warita A. Vieira, Lucas D. Novaes, Evandro Bacon, Christine D. Collevatti, Rosane G. Front Genet Genetics Despite the global importance of tropical ecosystems, few studies have identified how natural selection has shaped their megadiversity. Here, we test for the role of adaptation in the evolutionary success of the widespread, highly abundant Neotropical palm Mauritia flexuosa. We used a genome scan framework, sampling 16,262 single-nucleotide polymorphisms (SNPs) with target sequence capture in 264 individuals from 22 populations in rainforest and savanna ecosystems. We identified outlier loci as well as signal of adaptation using Bayesian correlations of allele frequency with environmental variables and detected both selective sweeps and genetic hitchhiking events. Functional annotation of SNPs with selection footprints identified loci affecting genes related to adaptation to environmental stress, plant development, and primary metabolic processes. The strong differences in climatic and soil variables between ecosystems matched the high differentiation and low admixture in population Bayesian clustering. Further, we found only small differences in allele frequency distribution in loci putatively under selection among widespread populations from different ecosystems, with fixation of a single allele in most populations. Taken together, our results indicate that adaptive selective sweeps related to environmental stress shaped the spatial pattern of genetic diversity in M. flexuosa, leading to high similarity in allele frequency among populations from different ecosystems. Frontiers Media S.A. 2020-12-23 /pmc/articles/PMC7786001/ /pubmed/33424928 http://dx.doi.org/10.3389/fgene.2020.596662 Text en Copyright © 2020 Melo, Vieira, Novaes, Bacon and Collevatti. http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
spellingShingle Genetics
Melo, Warita A.
Vieira, Lucas D.
Novaes, Evandro
Bacon, Christine D.
Collevatti, Rosane G.
Selective Sweeps Lead to Evolutionary Success in an Amazonian Hyperdominant Palm
title Selective Sweeps Lead to Evolutionary Success in an Amazonian Hyperdominant Palm
title_full Selective Sweeps Lead to Evolutionary Success in an Amazonian Hyperdominant Palm
title_fullStr Selective Sweeps Lead to Evolutionary Success in an Amazonian Hyperdominant Palm
title_full_unstemmed Selective Sweeps Lead to Evolutionary Success in an Amazonian Hyperdominant Palm
title_short Selective Sweeps Lead to Evolutionary Success in an Amazonian Hyperdominant Palm
title_sort selective sweeps lead to evolutionary success in an amazonian hyperdominant palm
topic Genetics
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7786001/
https://www.ncbi.nlm.nih.gov/pubmed/33424928
http://dx.doi.org/10.3389/fgene.2020.596662
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