1Plant Pathology Division, Department of Plant, Soil, and Entomological Sciences, University of Idaho, Moscow 83844-2339, U.S.A.; 2The Sainsbury Laboratory, John Innes Centre, Norwich Research Park, Colney, Norwich NR4 7UH, U.K.
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Accepted 23 September 1997.
In previous work, the pigB transcriptional unit of Xanthomonas campestris was implicated in the generation of a diffusible factor (DF) that regulates xanthomonadin and extracellular polysaccharide (EPS) production. Similarly, the rpfF and rpfB genes were implicated in the generation of a diffusible factor (DSF) that regulates the production of extracellular enzymes and EPS. In this study, extracel-lular cross-feeding studies with rpfF and pigB mutant strains provided evidence for the existence of two separate intercellular signaling systems with overlapping roles in the regulation of EPS production.
© 1998 The American Phytopathological Society