Selective sweeps lead to evolutionary success in an Amazonian hyperdominant palm
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2020-12
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Resumo
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 singlenucleotide
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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Population genomics, Neutral evolution, Mauritia flexuosa, Adaptation, Target sequence capture, Arecaceae
Citação
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. Frontiers in Genetics, Laussane, v. 11, p. 596662, 2020. DOI: 10.3389/fgene.2020.596662 . Disponível em: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7786001/pdf/fgene-11-596662.pdf. Acesso em: 9 mar. 2023.