Siderophores play an important role in the extracellular solubilization of iron from minerals and make it available to microorganisms (Lamont et al., 2002; Dale et al., 2004). Most of the bacterial siderophores are catecholates, and few are hydroxamates and carboxylates, whereas most fungal siderophores are hydroxamates (Schalk et al., 2011).