Figure 4

Temperature-dependent production of a secondary siderophore by pyoverdine null P. syringae 1448a. Wild type and pyoverdine null P. syringae 1448a colonies were inoculated into identical Kings B plates containing CAS dye. Both plates were incubated at 28°C for 24 h, following which plate B was removed to 22°C for the remainder of the experiment while plate A was maintained at 28°C. For each plate, wild type is on the left, and the pyoverdine null strain is on the right.