Fig. 6

Comparison of VOCs production by M. aeruginosa LTPNA 01 and LTPNA 08 during growth time in the treatment (addition of β-ionone standard). A. β-ionone production by both strains. B. β-cyclocitral production by both strains. Different letters represent significant differences overgrowth time in each strain (for both compounds in LTPNA 01: Kruskal–Wallis One Way Analysis of Variance on Ranks followed by Tukey post-test, p < 0.05; for both compounds in LTPNA 08: One Way Analysis of Variance followed by Tukey post-test, p < 0.05). * represents a significant difference between the strains for each growth time (Student t test or Mann–Whitney Rank Sum Test (at 6 days for β-cyclocitral), p < 0.05)