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Pseudomonas syringae pv. syringae B728a, a causal agent of bacterial brown spot on snap beans, swarms with a characteristic dendritic pattern on semisolid (0.4%) agar plates. Filamentation of swarming cells of B728a was not observed. Mutations in either thegacS (formerlylemA ) orgacA gene of B728a eliminate the ability of thisP. syringae isolate to swarm without obvious effects on bacterial motility. Three field isolates showed a similar dependence ongacS for swarming. SincegacS andgacA mutants are known to be deficient inN -acyl-l -homoserine lactone (acyl-HSL) production, a mutant was constructed by disruption of theahlI gene of B728a. This mutant did not make any acyl-HSL detectable by theAgrobacterium traG ::lacZ reporter system, yet was unaffected in its ability to swarm. Other phenotypes ofgacS andgacA mutations were similarly unaffected in theahlI mutant.

journal of bacteriology

Swarming by Pseudomonas syringae B728a Requires gacS ( lemA ) and gacA but Not the Acyl-Homoserine Lactone Biosynthetic Gene ahlI