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. 2013 Mar 7;13:39. doi: 10.1186/1471-2229-13-39

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Copyright ©2013 Emanuelli et al.; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Flow chart of hierarchical STRUCTURE analysis of the Vitis germplasm using 1085 unique accessions at 22 SSR loci and 1072 unique accessions at 353 SNP loci. Plots generated with the DISTRUCT software based on the Q-matrix consensus permuted across 10 replications for each K using the CLUMPP software. In the first chart, samples of the four predefined groups are separated by black lines, while in subsequent charts, populations found by previous rounds of analysis are separated. Ultimately for the SSR and SNP data, respectively, there are: 1 cluster of rootstocks (Rs/Rs^I), 1 cluster of Vitis vinifera sylvestris (VS/VS^I) and 5 subclusters of cultivated grapevine: VV1, VV2, VV3, VV4/ VV1^I, VV2^I, VV3^I, VV4^I). Q – membership coefficient.