Figure 1.—

Genomic locations of QTL identified for B. cinerea lesion size and A. thaliana camalexin accumulation. A. thaliana chromosomes are identified by roman numerals (I–V), with centimorgans ascending from the left; chromosomes are separated by gray lines. Each row represents a B. cinerea isolate × trait × experiment combination, with isolate and experiment indicated by text labels, and trait indicated by text color (green, lesion-1, lesion-i; orange, lesion-2; red, lesion-3; black, camalexin). CTRL indicates noninoculated leaves. Rows are clustered to show overall similarity of QTL architecture, using the weighted group average (WPGMA) linkage based on the absolute value of Pearson correlation distances. Lesion phenotypes (top) and camalexin (bottom) are clustered separately. Colored cells indicate QTL significant at P = 0.05 in CIM models; blue indicates positive association of trait values with Bay alleles and yellow indicates positive association of trait values with Sha alleles. QTL selected for directed analysis of epistasis are shown with gray arrows at the lower edge of the heat map. QTL positions, LOD scores, additive effects, and R² values are provided in supplemental Table 1.