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. 2021 Jul 29;11(10):jkab262. doi: 10.1093/g3journal/jkab262

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© The Author(s) 2021. Published by Oxford University Press on behalf of Genetics Society of America.

This is an Open Access article distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs licence (http://creativecommons.org/licenses/by-nc-nd/4.0/), which permits non-commercial reproduction and distribution of the work, in any medium, provided the original work is not altered or transformed in any way, and that the work is properly cited. For commercial re-use, please contact journals.permissions@oup.com

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Signatures of rapid evolution among potato species Sst, Sph, and Sch. (A) Phylogenetic tree of eight closely related Solanum species constructed from a concatenated alignment of single-copy genes. (B) Synonymous substitution rate (Ks) distribution of orthologous gene sets among Sst, Sph, and Sch. Horizontal and vertical axes represent the log2 values of the synonymous substitution rate and proportion, respectively. (C) Chart showing the synonymous (Ks) and nonsynonymous (Ka) substitution rates, and selection pressure (Ka/Ks) between Sst and Sph and between Sst and Sch. Ka/Ks = 1 indicates genes with neutral selection, Ka/Ks > 1 indicates positive selection, and Ka/Ks < 1 indicates negative selection.