Fig. 2

Primary population structure and UPGMA clustering for 180-accession panel of Ocimum species. Unweighted pair group method using arithmetic average (UPGMA) dendrogram aligned with primary model-based clustering of Ocimum spp. 180-accession panel and 2 outgroup accessions (1 and 2) using 20 EST-SSR markers. Genetic distance was calculated using the Jaccard Similarity Coefficient (x-axis) and bootstrap support values are the result of 1000 permutations with support value greater than 0.500 shown. Three clusters (K) were inferred using Structure ver 2.2.3 and membership to each cluster is represented by proportion of yellow, orange or blue colors within horizontal lines corresponding to each accession. Numbers right of membership histograms correspond to accessions. Response to downy mildew is indicated resistant (R) = DS < 1.0, intermediate (I) = 1.0 < DS < 3.0 or susceptible (S) = DS > 3.0. Accessions with response R* share a single source of resistance conferred by accession MRI. The figure is divided into two segments a (left) and b (right)