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

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 ge...

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Bibliographic Details
Published in:Royal Society open science 2018-01, Vol.5 (1), p.171198-171198
Main Authors: Böndel, Katharina B., Nosenko, Tetyana, Stephan, Wolfgang
Format: Article
Language:English
Subjects:
Abiotic Stress
Biology (whole Organism)
Local Adaptation
Plant Population Genetics
solanum chilense
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Summary: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.
ISSN:2054-5703
2054-5703
DOI:10.1098/rsos.171198