Figure 2From: Genome-wide association mapping of quantitative resistance to sudden death syndrome in soybeanPopulation structures of soybean cultivars in association panels P1 and P2. (a) Neighbor-joining tree of 392 accessions in panel P1. The four subgroups identified from the tree are color-coded in a and b. (b) PCA plots of the first two components of 392 accessions in panel P1. (c) Neighbor-joining tree of 300 accessions in panel P2. The six subgroups identified from the tree are color-coded in c and d. (b) PCA plots of the first two components of 300 accessions in panel P2.Back to article page