R-genes are often major dominant genes that provide complete or qualitative disease resistance, becoming interesting targets for introgression in breeding programs. Over time, plant pathogens can modify their effectors, avoiding recognition, and thus resistance mediated by R-genes can be overcome in new cultivars after their deployment (Jones and Dangl 2006; Peressotti et al. 2010). Stacking of several loci has been proposed as a mechanism to prolong the durability of R-genes, but the selection of multiple loci that generate the same phenotype requires the use of molecular markers through marker-assisted selection (MAS).