Fig. 3
From: Loci and candidate genes conferring resistance to soybean cyst nematode HG type 2.5.7
The linkage disequilibrium (LD), principal component and kinship analyses of soybean genetic data. (a) The linkage disequilibrium (LD) decay of the genome-wide association study (GWAS) population. (b) The first three principal components of the 33,194 SNPs used in the GWAS indicated little population structure among the 200 tested accessions. (c) The population structure of the soybean germplasm collection reflected by principal components. (d) A heat map of the kinship matrix of the 200 soybean accessions calculated from the same 33,194 SNPs used in the GWAS, suggesting low levels of relatedness among the 200 individuals