Figure 1.
Figure 1.

Diversity analysis of the sorghum accessions. (A) STRUCTURE (Pritchard et al., 2000) results: five subpopulations (G) corresponded to races. (B) Neighbor joining tree: branches (B1–B5) generally agreed to subpopulations (G) based on STRUCTURE results. (C) Number of accessions from specific races within each subpopulation. D, durra; K, kafir; ZC, zerazera-caudatum; B, bicolor; GB, guinea-bicolor; MF, milo-feterita; SB, sudanese-broomcorn; C, caudatum; GC, guinea-caudatum.

 


Figure 2.
Figure 2.

General congruence among principal component analysis (PCA), STRUCTURE (Pritchard et al., 2000) classification, and race classification. (A) Principal component analysis and STRUCTURE classification were consistent. Each color represents a subpopulation based on STRUCTURE results. (B) Geographical origin differences between the subpopulations in sorghum diversity panel shown on world map. Red triangles represent G1, green triangles represent G2, blue circles represent G3, yellow boxes represent G4, and pink boxes represent G5. PC, principal component.

 


Figure 3.
Figure 3.

Variations in three grain quality traits among different subpopulations of sorghum diversity panel. (a) Kernel hardness (KH). (b) Acid detergent fiber (ADF). (c) Total digestible nutrients (TDN). The error bar represents the standard error. G1, G2, G3, G4, and G5 consist of 49, 46, 52, 49, and 69 accessions, respectively.

 


Figure 4.
Figure 4.

Consistency of single nucleotide polymorphism (SNP) alleles is shown across five subpopulations. Each bar represents mean value of accessions with significant SNP allele. Error bar represents the standard error. KH, kernel hardness.