Number of markers required for association mapping studies.

aDecay of LD with physical distance were fitted according to Ohta and Kimura (1969) [37] model: E (r2ij) = 1/(1+4Neρdijρ). Where, r2ij stands for the LD value between markers i and j, Ne for the effective population size, ρ for the per base recombination rate and dij for the distance in base pairs between markers i and j. The analysis was performed with the nls function in R. The composite parameter a = Neρ was estimated for the whole CS and the different genetic groups.bAchieved convergence tolerance obtained with the nls function in R.