FIG 4.

Effect of Bion (A) and BABA (B) at different concentrations as 24-h preinoculation treatments by root drench on the endophytic multiplication of S. Typhimurium in leaves of young potted romaine lettuce plants inoculated by vacuum infiltration. Data represent the means of the log-transformed population sizes of the pathogen for two, three, and four replicate leaves sampled from three replicate pots immediately, and 24 and 48 h after inoculation, respectively, and SEM. *, **, and *** indicate significant differences (P < 0.05, 0.01, and 0.001, respectively) in Salmonella population sizes between elicitor- and H₂O-treated plants, as determined by Dunnett’s multiple-comparison test.