Figure 4: Identity-by-descent (IBD) relatedness between GBS samples.

A heatmap is shown for IBD between 258 samples over 11,906 SNPs. More saturated colors indicate higher levels of IBD. The accessions are highlighted by collection and clustered so that those with similar relationships are closer together in the plot. Groups of samples that have identical genotypes at our markers appear as bright red boxes near the diagonal (Supplementary Note 9, Supplementary Table 14); bright green signals indicate likely first-degree relationships. See Table 2 for collection descriptions.