FIGURE 3.
Growth promotion of Arabidopsis after 11 days of exposure to VOCs of Pf.SBW25 or the Gac-mutant (A). Quantitative analysis of the dry weight (DW) of Arabidopsis after 11 days of exposure to VOCs of Pf.SBW25 or the Gac-mutant (B). Bars represent standard deviation of the mean of 4 independent biological replicates (with 8–10 seedlings per replicate). Asterisks indicate a statistical difference as compared to controls (exposed to medium only) using Student’s t-Test (p < 0.05, n = 4). Induced systemic resistance of Arabidopsis against the leaf pathogen Pseudomonas syringae pv. tomato (Pst) (C). Rhizosphere acidification of Arabidopsis after 8 or 11 days of exposure to VOCs of Pf.SBW25 or the Gac-mutant (D). Orange colour of the medium reflects pH decline.