Figure 6.

Sorghum racial identity and subpopulation structure. PCA plot of the 580 exotic progenitor (EP) lines genotyped in this study. Each dot represents an EP line, colored according to its morphologically-defined race. Larger circles and smaller triangles represent EP lines with more and fewer than 10% unexpected genotypes, respectively. The grey dashed lines indicate the criteria used to assign EP lines to genetic groups for subpopulation-specific introgression mapping.