Ability of fungal strains isolated from the rhizosphere and bulk soil of okra to release a) salicylic acid, b) sugars and c) proteins in the culture broth. The strains were cultivated for 10 days in Czapek liquid broth, and the culture filtrate was analyzed for the selected metabolites. Mean values (± standard deviation) are shown, with significant differences between strains indicated by different letters (p < 0.05).