Siderophores are typically produced by bacteria, fungi, and
monocotyledonous plants under iron-limited conditions
(Loaces et al. 2011), making it antagonist against plant pathogens
and inducing systemic resistance in plants (Ahmad et al.
2008). In our experiment, six isolates of EDB produced
siderophores. The different color changes in the CAS agar to
yellow or purple suggested the production of different types of
siderophores, such as catecholates, hydroxamates and α-
carboxylates, depending on the chemical nature of thei
rcoordination sites with iron (Winkelmann 1990; Pérez-
Miranda et al. 2007).