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(a) The production of siderophores based on the formation of an orange zone around colonies on CAS agar after 72 h of incubation. Strain ZR4 presented positive production of siderophores, while strain TS4 show no production of siderophores. (b) Phosphate solubilizing by the ZR1 strain on Pikovskaya agar after 120 h of incubation. (c) Oligonitrotrophic bacteria ER1 on Nitrogen-free (Nfa) agar medium and Ashby’s mannitol agar (in zoom) after 72 h of incubation.
