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[Direct screening of antibiotics-siderophores of bacterial origin]
Abstract:
Antifungal activity of 275 strains belonging to 15 species of Pseudomonas was studied with using media containing no iron or supplemented with 100 micrograms/ml of FeCl3. 33 per cent of the cultures showed lower activity against phytopathogenic fungi in the presence of iron. Addition of this element did not influence the antifungal activity of phenazin and floroglucin derivatives isolated from Pseudomonas cultures. However, its addition markedly lowered the antifungal effect of some crude antibiotics and fluorescent pigments. A scheme for screening siderophore antibiotics with using Pseudomonas cultures is described.
Insights
Iron significantly impacts Pseudomonas antifungal activity, reducing the efficacy of crude antibiotics and fluorescent pigments against phytopathogenic fungi. This finding aids in developing targeted antifungal strategies.
Area of Science:
- Microbiology
- Biochemistry
Context:
- Pseudomonas species are known for their diverse metabolic capabilities, including the production of antimicrobial compounds.
- Iron availability is a critical environmental factor influencing microbial growth and secondary metabolite production.
Purpose:
- To investigate the effect of iron supplementation on the antifungal activity of Pseudomonas strains.
- To determine how iron influences the production or efficacy of Pseudomonas-derived antifungal agents.
Summary:
- Antifungal activity was assessed for 275 Pseudomonas strains across 15 species using iron-deficient and iron-supplemented media.
- 33% of strains exhibited reduced antifungal activity against phytopathogenic fungi when iron was present.
- Iron addition did not affect phenazine and floroglucin derivatives but decreased the activity of crude antibiotics and fluorescent pigments.
Impact:
- Highlights the crucial role of iron in modulating the antifungal potential of Pseudomonas.
- Provides insights for optimizing conditions for screening and utilizing Pseudomonas-based biocontrol agents.
- Suggests a method for screening siderophore antibiotics using Pseudomonas cultures.