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Synthesis of SA and Ybt requires a functional pchA gene. Shown are SA (gray) and Ybt (black) measured in iron-limited culture supernatants at 24 hpi with wild-type (wt) P. syringae pv. tomato DC3000 or the pchA DC3000 mutant. The DC3000 pchA mutation is in the isochorismate synthase gene of the putative Ybt biosynthetic cluster. nd, not detected (below detection limit).
