Fig. 3

The principal component analysis (PCA) plot of the 172 spinach genotypes. The horizontal and vertical axis represents the first and second principal components, and the variances explained by each component are noted. Colors correspond to members of subpopulations Q1 (red), Q2 (green), and admixed group Q1Q2 (blue). Resistant and susceptible genotypes are resented by “plus” and “filled circle” signs