Supplementary Figure S3.
PA-pretreatment similarly reduced tomato susceptibility to P. syringae DC3000, as the mean number of specks per cm2of leaf area in the first and second leaves was reduced by 33% and 50% respectively (P = 0.038 and P < 0.001). In the third leaf, which was still emerging, there was no significant effect (P = 0.11). As PA is not acutely toxic to either P. syringae or B. cinerea (Table 1 ), the reduced disease severity is likely caused by IR.