Fig. 3 QTL for resistance to E. carotovora ssp. atroseptica determined on the basis of GLM and datasets TR94/95 and LR94/95/96. Four marker genotypic classes were tested with GLM procedure for differences between class means x₁₃, x₁₄, x₂₃ and x₂₄. Rectangles contain the results obtained for QTL Eca1A, Eca4A, Eca6A, Eca2A and Eca11B (see Fig. 2 for location) including amount of variance explained (R²) and probability level (P) when using pairs of marker fragments, one from the seed and one from the pollen parent. Class means are shown as black bars for tuber resistance (millimeters rotted tissue) and white bars for leaf resistance (visual score for rotted tissue between 1 and 5, where 5 is resistant). Significant differences (P < 0.05) between class means are indicated by a and b. n = number of plants in each marker class. Note that differences between the total number of plants analyzed per locus result from missing values