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Examples of plant growth promoting trait tests: (A) bacterial growth on Jensen’s medium, indicating putative nitrogen fixation capabilities, (B) orange zones on Chromeazul S (CAS) medium, indicating siderophore production, (C) supernatant color change to red after addition of Salkowski reagent, indicating indole-3-acetic acid (IAA) production, (D,E) clear zones in insoluble phosphate enriched media, indicating phosphate mineralization and solubilization respectively.
