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Isolated grapevine endophytes. (A) Grapevine endophyte showing antibiosis production towards a layer of Bacillus subtilis on a petri dish. Bar = 1 cm. (B) Grapevine endophytes, including some showing positivity (discoloring to yellow background in the Chrome Azurol-S assay) to an iron-solubilization test for siderophores. Bar = 1 cm.
