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Effect of RhlR/RhlI QS system on Psl polysaccharide biosynthesis. (A) Swarming zones of rhlRI-inducible PAO/rhlRI and ΔrhlR/rhlRI mutant strains grown with or without arabinose. (B) Psl and RL production of PAO/rhlRI and the ΔrhlR/rhlRI mutant at various concentrations of arabinose. The amount of RL was normalized to the PAO1/vector level (214 ± 3 mg/liter). *, P < 0.05; ND, not determined.
