Abstract
A bacterial strain identified as Comamonas acidovorans NB-10II was isolated from water pond in South Jordan. It was found to have an antifungal activity against filamentous fungi (Aspergillus niger SQ 40, Fusarium oxysporium SQ 11,Verticillium dahliae SQ 42), yeasts (Saccharomyces cerevisiae SQ 46, Candida albicans SQ 47). All gram-positive bacteria (Bacillus megaterium SQ 5, Bacillus cereus SQ 6, Staphylococcus aureus SQ 9, Streptococcus pyogenes SQ 10) and gram-negative bacteria (Escherichia coli SQ 22, Klepsiella spp SQ 33,Pseudomonas mallei SQ 34) were found to be resistant. The isolate NB-10II was found to accumulate the main portion of the antimicrobial substances in their cells. In batch culture, the active antimicrobial substances accumulated at the late growth cycle, reaching their maximum at 42 h of growth. The data clearly show an antifungal activity ofC. acidovorans against filamentous fungi and yeasts, and indicated the possibility of using NB-10II as a source of antimicrobial substances or as a biocontrol agent of some plant diseases in Jordan. Key words: Antifungal activity, Comamonas acidovorans, Pseudomonas.
Highlights
The genus Pseudomonas has been heterogenous since Migula first named it in 1894 (Migula, 1894)
Emphasis was laid on the isolation of antimicrobial substances producing bacteria from water pond
The screening of antimicrobial substances producing bacteria isolated from water pond in south Jordan yielded a number of bacterial isolates
Summary
Antifungal activity of Comamonas acidovorans isolated from water pond in south Jordan. A bacterial strain identified as Comamonas acidovorans NB-10II was isolated from water pond in South Jordan. It was found to have an antifungal activity against filamentous fungi (Aspergillus niger SQ 40, Fusarium oxysporium SQ 11, Verticillium dahliae SQ 42), yeasts (Saccharomyces cerevisiae SQ 46, Candida albicans SQ 47). The isolate NB-10II was found to accumulate the main portion of the antimicrobial substances in their cells. The active antimicrobial substances accumulated at the late growth cycle, reaching their maximum at 42 h of growth. The data clearly show an antifungal activity of C. acidovorans against filamentous fungi and yeasts, and indicated the possibility of using NB-10II as a source of antimicrobial substances or as a biocontrol agent of some plant diseases in Jordan
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