Swarming by Pseudomonas syringae B728a requires gacS (lemA) and gacA but not the acyl-homoserine lactone biosynthetic gene ahlI.

Abstract excerpt

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 the gacS (formerly lemA) or gacA gene of B728a eliminate the ability of this P. syringae isolate to swarm without obvious effects on bacterial motility. Three...

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