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J. Bacteriol. doi:10.1128/JB.00827-07
Copyright (c) 2007, American Society for Microbiology and/or the Listed Authors/Institutions. All Rights Reserved.

Salicylic Acid, Yersiniabactin, and Pyoverdin Production by the Model Phytopathogen Pseudomonas syringae pv tomato DC3000: Synthesis, Regulation, and Impact on Tomato and Arabidopsis Host Plants

Department of Plant and Microbial Biology, 111 Koshland Hall, University of California at Berkeley, Berkeley, CA 94720-3102

^* To whom correspondence should be addressed. Email: Wildermuth{at}nature.berkeley.edu.

	Abstract

A genetically tractable model plant pathosystem, Pseudomonas syringae pv. tomato DC3000 on tomato and Arabidopsis thaliana hosts, was used to investigate the role of salicylic acid (SA) and iron acquisition via siderophores in bacterial virulence. Pathogen-induced SA accumulation mediates defense in these plants, and DC3000 contains the genes required for the synthesis of SA, the SA-incorporated siderophore yersiniabactin (Ybt), and the fluorescent siderophore pyoverdin (Pvd). We found that DC3000 synthesizes SA, Ybt, and Pvd under iron-limiting conditions in culture. Synthesis of SA and Ybt by DC3000 requires pchA, an isochorismate synthase gene in the Ybt genomic cluster, and exogenous SA can restore Ybt production by the pchA mutant. Ybt was also produced by DC3000 in planta, suggesting Ybt plays a role in DC3000 pathogenesis. However, the pchA mutant did not exhibit any growth defect or altered virulence in plants. This lack of phenotype was not attributable to plant-produced SA restoring Ybt production as the pchA mutant grew similarly to DC3000 in an Arabidopsis SA biosynthetic mutant and in planta Ybt was not detected in pchA-infected wild type plants. In culture, no growth defect was observed for the pchA mutant vs. DC3000 for any condition tested. Instead, enhanced growth of the pchA mutant was observed under stringent iron limitation and additional stresses. This suggests that SA and Ybt production by DC3000 is costly and Pvd is sufficient for iron acquisition. Further exploration of the comparative synthesis and utility of Ybt versus Pvd production by DC3000 found siderophore-dependent amplification of ybt gene expression to be absent suggesting Ybt may play a yet unknown role in DC3000 pathogenesis.