Fruit firmness and softening QTL dynamics over linkage group 10 of Mondial Gala and Fuji. LOD profiles are plotted for Mondial Gala and Fuji with regard to the fruit firmness at harvest (a and f), fruit firmness after 2 months of cold storage (b, g), fruit softening after 2 months of cold storage (c, h), firmness after 30 d of room temperature ripening following harvest (d, i), and relative softening (e, j). Black and grey lines represent year 2 and 3, respectively. Dotted lines indicate the interval mapping computation, and the solid lines show multiple QTL mapping (MQM) profiles. The analysis of firmness and softening measured after 30 d of room temperature was carried out only in year 3. The two horizontal dashed lines at LOD 1.6 and 3.3 indicate chromosome-wide and genome-wide thresholds after a permutation test.