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Signatures of natural selection in abiotic stress-responsive genes of Solanum chilense.


ABSTRACT: Environmental conditions are strong selective forces, which may influence adaptation and speciation. The wild tomato species Solanum chilense, native to South America, is exposed to a range of abiotic stress factors. To identify signatures of natural selection and local adaptation, we analysed 16 genes involved in the abiotic stress response and compared the results to a set of reference genes in 23 populations across the entire species range. The abiotic stress-responsive genes are characterized by elevated nonsynonymous nucleotide diversity and divergence. We detected signatures of positive selection in several abiotic stress-responsive genes on both the population and species levels. Local adaptation to abiotic stresses is particularly apparent at the boundary of the species distribution in populations from coastal low-altitude and mountainous high-altitude regions.

SUBMITTER: Bondel KB 

PROVIDER: S-EPMC5792908 | biostudies-literature | 2018 Jan

REPOSITORIES: biostudies-literature

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Signatures of natural selection in abiotic stress-responsive genes of <i>Solanum chilense</i>.

Böndel Katharina B KB   Nosenko Tetyana T   Stephan Wolfgang W  

Royal Society open science 20180117 1


Environmental conditions are strong selective forces, which may influence adaptation and speciation. The wild tomato species <i>Solanum chilense</i>, native to South America, is exposed to a range of abiotic stress factors. To identify signatures of natural selection and local adaptation, we analysed 16 genes involved in the abiotic stress response and compared the results to a set of reference genes in 23 populations across the entire species range. The abiotic stress-responsive genes are chara  ...[more]

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