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Production of siderophores by Pseudomonas strains: (A) catechol-type compared to the standard SA (p > 0.05, ns—not significant), (B) catechol-type in relation to 2,3-DHBA (*; p < 0.05), (C) pyoverdine (p > 0.05, ns), and (D) CAS assay after four days of incubation (p > 0.05, ns). Student’s t-test with a 95% confidence level was applied for statistical analysis.
