The relationship between the p-distance and the success rate in amplifying the same gene among taxa. The general trend is that the larger p-distance between target taxa, the smaller success rate in amplifying the same gene (r = -0.24, p = 0.15). However, confident assessment on the potential usefulness of a gene marker based on the experience in related taxa can only be made when their p-distance ≤ 0.06 in our study (the crosses).
Li et al. BMC Evolutionary Biology 2010 10:90 doi:10.1186/1471-2148-10-90