Schematic overview of DRYM QTL mapped in cultivated potato. QTL for the DRYM index (95% confidence interval) mark the genomic regions associated with drought tolerance on the genetic maps of each parental chromosome (1–12) in the drought-tolerant parent Albatros (A, left) and in the drought-sensitive parent Ramses (R, right). Most DRYM QTL (2014, light green; 2015, green; 2016, dark green) co-localized with tuber starch yield QTL (Table 1), and only few DRYM QTL (asterisks) did not. Microsatellite markers (descriptions in Tables S1 and S2) and AFLP markers within or flanking QTL regions are shown.