Figure 4From: A eukaryotic-type signalling system of Pseudomonas aeruginosa contributes to oxidative stress resistance, intracellular survival and virulencePlant (lettuce) infection assay with the P. aeruginosa PAO1 (1, 3) and Δ pppA - ppkA (2, 4) strains. The photograph shows a representative example of lettuce midribs after three days of infection. Infection by PAO1 shows necrosis and tissue maceration.Back to article page