Fig. 4.

Genetic structure of the 72 tomato accessions. For each marker system is shown the bar plot with individuals represented by a thin vertical line, which is partitioned into K-colored segments whose length is proportional to the estimated membership coefficient (q) (right panel). The loading plot in the first two components, showing the diversity of the 72 studied accessions are displayed (central panel). Accessions in the PCA biplot are annotated considering the K subdivision following the population structure analysis. The cross-validation error for different admixture or structure models (K = 1–10) are shown (left panel). a ADMIXTURE analysis with 21,020 ddRADseq-SNPs markers showing 3 (K = 3) groups according to the most informative K value (lowest value); b STRUCTURE analysis with 96 CE-SSR polymorphic loci showing 2 (K = 2) groups according to the most informative K value (highest value); c STRUCTURE analysis with 98 HRM-SSR polymorphic loci showing 3 (K = 3) groups according to the most informative K value (highest value)