FIGURE 6.

Regressions between rootstock’s breeding (GEBV, βx_i) and admixture indices as proxy of heterotic effects. Only traits significantly linked with the rootstocks’ genotypes, after accounting for regional agroecological differences, are depicted, as follows: (A) trunk height, (B) number of fruits, (C) number of fruits with exportation quality, (D) number of fruits with damage caused by thrips, and (E) number of fruits discarded because of low weight. Overall tendency lines are drawn in gray if significant at a p-value threshold of 0.05. Admixture index at an optimum K-value of 3 is detailed in Figure 2. Regressions controlled for agroecological region as random effect via MLM models in R’s (v.3.4.4, R Core Team) package nlme (Pinheiro et al., 2011). Dots and dashed tendencies are colored according to Figure 1, as follows: dairy Northern Andean highland plateau in green, Eastern Andean highland plateau in red, and Southwest coffee region in orange.