Fig. S1. Fe-Ligand chemistry. Fe-Ligand chemistry is illustrated using EDTA as a model ligand. Steady-state Fe′ concentrations are dependant on the formation and dissociation reactions of the FeEDTA complex and the concentrations of Fe and EDTA in such a system. Photoreduction reactions are depicted as well as the competition with oxygen by FZ for Fe(II) species.

Fig. S2. Siderophore production in Fe-deplete and Fe-replete cultures.

Table S1. Short-term and steady-state iron uptake.

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