Graphical display of population substructure for 248 genotypes at a population size K = 4. Population substructure was determined using STRUCTURE  with 82 high quality SNP markers. Each genotype is represented by a vertical line. Color segments within the vertical line indicate the proportion of membership in each of the four population substructure groups. Population substructure groups are color-coded as population one (red), population two (green), population three (blue), and population four (yellow). Numbers in parenthesis indicate the number of genotypes with majority membership (greater than 50%) in each population group and the total number of genotypes for each market class.