Structure analysis of parental lines and correlation of structure with genome-wide recombination rate. (A) Probability of each parental inbred line to belong to the Dent (red) and the Flint (blue) groups. (B) For each of the 23 populations, correlation between the average probability of the two parents of the population to belong to the Flint group, and genome-wide recombination rate (GWRR) in the population. (C) For each of the 19 founder lines excluding B73, correlation between the probability to belong to the Flint group, and the contribution to GWRR for that parental line, using an additive model whereby the GWRR for a cross is the average GWRR of the two parents of the cross. The effect of the central line was corrected for based on the two populations CFD02 and CFF02, which involve B73 crossed to the two central lines F353 and UH007.