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. 2020 Jul 22;20:346. doi: 10.1186/s12870-020-02547-5

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© The Author(s) 2020

Open AccessThis 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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

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Fig. 2 — Population structure analysis of 328 barley accessions. (a) Phylogenetic neighbour-joining (NJ) tree of 328 barley accessions constructed based on genetic distances, highlighting their origins, row types and growth habits in different colours. (b) Principal component analysis (PCA) of 328 barley accessions using the first two components, according to their origins, row types and growth habits. (c) Population structure using ADMIXTURE for 328 worldwide barley genotypes with 19,014 SNPs. The subpopulations are presented in different colours, and the proportional membership in the population is indicated by the colour of the individual haplotypes. The CLUMPP was used to merge the membership coefficients across 100 replicate runs. According to the CV error, the K value (number of clusters) in the population of 328 accessions was determined to be 7