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Inhibitory effect of 4-hydroxybenzoic acid and vanillic acid on GFP-expressing Pseudomonas syringae pv. tomato DC3000. CA9-5 cells supplemented with two-fold serial dilutions of 4-hydroxybenzoic acid (A) and vanillic acid (B) were incubated in hrp--inducing medium. After 6 h, the fluorescence intensity of each treatment was measured. Different letters on the bars indicate significant difference (P < 0.05) between concentrations.
