Figure 1

Linkage disequilibrium of the B. napus diversity set. Plot of linkage disequilibrium measured by squared allele frequency correlations (r ², dots) versus physical map distance (Mb) between linked single nucleotide polymorphism (SNP) marker loci in the B. napus diversity set. The solid line represents the nonlinear regression trend line of r ² versus the physical map distance, whereas the dashed line indicates the threshold of the 95% quantile of r ² between unlinked loci pairs. The inset gives an enhanced view of the r ² decay over smaller physical map distances (kb).