Fig. 3

The soxR gene of P. xenovorans LB400 complements faulty oxidative response in P. aeruginosa ∆soxR. A Susceptibility assays of P. aeruginosa strains PA14 wt, and mutant strains (∆soxR, ∆soxR::BxeC1217 and ∆soxR::PA2273) exposed to paraquat (PQ). Paper disks soaked with paraquat (10 or 20 mM) were placed on P. aeruginosa bacterial lawns. Growth inhibition zones around the disks were recorded after 24 h at 37 °C. The dotted line at 6 mm corresponds to the disk diameter and indicates no detectable inhibition. Inhibition zone values were calculated as the mean ± SD of three independent experiments. Letters under the error bars indicate significant differences between strains in each treatment. B Growth of P. aeruginosa wt and mutants strains exposed to phenazine methosulfate (PMS) (600 µM). Control cells were grown in absence of PMS. Images are representative of three independent experiments