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. 2020 Mar 13;10:4642. doi: 10.1038/s41598-020-61216-7

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Genetic diversity in Coffea. Number of variant sites and their distribution among the three species (panel A), number of individuals n = 53 in C. canephora, n = 10 in C. eugenioides, n = 736 in C. arabica. Principal Component Analysis within C. arabica using all variant sites (panel B) or only variant sites on the canephora (panel C) or on the eugeniodes subgenome (panel D), separately. Individuals were grouped a priori into geographical classes. Principal Component Analysis of the Arabica populations (panel E) using all variant sites, as in panel B, in relation to ancestry assignment provided by the software STRUCTURE. Map of Ethiopia and Yemen showing the locations of coffee accessions (panel F), as a function of their STRUCTURE population, as in panel E.