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. 2010 Mar 5;76(9):2704–2711. doi: 10.1128/AEM.02979-09

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FIG. 3. — (A) Siderophore production by P. syringae pv. syringae 22d/93 and siderophore mutants of this strain on CAS agar. CAS agar plates were inoculated with 5-μl portions of suspensions (>10⁶ CFU/ml) of the different strains and incubated at 28°C for 48 h. Siderophore production is indicated by the formation of haloes. 1, P. syringae pv. syringae 22d/93; 2, P. syringae pv. syringae 22d/93ΔAch; 3, P. syringae pv. syringae 22d/93ΔSid; 4, P. syringae pv. syringae 22d/93ΔPvd. (B) Growth of P. syringae pv. syringae 22d/93 and siderophore mutants of this strain in PIPES medium at 28°C, as determined by measurement of the OD₆₀₀. The data are the means and standard deviations of three independent cultures. □, P. syringae pv. syringae 22d/93; ▿, P. syringae pv. syringae 22d/93ΔAch; ▵, P. syringae pv. syringae 22d/93ΔPvd; ⧫, P. syringae pv. syringae 22d/93ΔSid.