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.