Figure 1.
Figure 1.

Frequency distribution of number of markers in each allele category across hard wheat (Hard), soft wheat (Soft), and combined hard and soft (Total) accessions.

 


Figure 2.
Figure 2.

Dendrogram showing the relationships among 137 hard wheat accessions and 68 soft wheat accessions as revealed by cluster analysis based on Nei (1973) genetic distance. The colors on the map show the geographical distribution of subgroups estimated from hard and soft wheat on the basis of their genetic distance. The number in the map indicates the total number of accessions collected from the state. The digits on the cluster tree represent the accessions corresponding to Supp. Table 1.

 


Figure 3.
Figure 3.

Four subpopulations inferred from structure analysis. The vertical coordinate of each subpopulation indicates the membership coefficients for each individual, and the digits on the horizontal coordinate represent the accessions corresponding to Supp. Table 1.

 


Figure 4.
Figure 4.

Principal coordinate analysis (PCoA) of 205 U.S. wheat accessions. The different colors represent the four subpopulations inferred by structure analysis. Hard was clearly separated from soft by the first principal component, whereas south-central Hard and north Hard could be roughly separated by the second principal component.

 


Figure 5.
Figure 5.

Wheat consensus map assembled from 186 SSR markers and genome-wide distribution of LD of 205 U.S. wheat accessions. Red: P < 0.0001; Green: P < 0.001; Blue: P < 0.01; No fill: P > 0.01. Centromere region for each chromosome is marked with an ellipse. *markers used for structure analysis.

 


Figure 6.
Figure 6.

Genome-wide LD (r2) distribution against the genetic distance. The simulation trend line within 20 cM showed that the r2 declined to below 0.1 within 10 cM.