A gene for a dioxygenase-like protein determines the production of the DF signal in Xanthomonas campestris pv. campestris.

SUMMARY The DF signal molecule regulates the production of both yellow pigments (xanthomonadins) and extracellular polysaccharide (EPS) in Xanthomonas campestris pv. campestris. These two bacterial products are crucial to the epiphytic survival and pathogenicity of this pathogen on its plant hosts.