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Research Journal of Microbiology
Year: 2011  |  Volume: 6  |  Issue: 8  |  Page No.: 645 - 657

Biological Control of Some Pathogenic Fungi using Marine Algae Extracts

H.R.M. Galal, W.M. Salem and F. Nasr El-Deen    

Abstract: The present research has been conducted to explore the antifungal potency of the methanol and ethyl acetate crude extracts of seaweeds collected from the red sea, Hurghada, Egypt. The concentration of (50 mg mL-1) was tested against Alternaria alternata, Fusarium oxysporium, Alternaria brassicicola, Ulocladium botrytis and Botryotrichum Piluliferum. The antifungal activities were expressed as inhibition in dry mass (mg), protein content (μg mL-1) and enzymatic activity of pectinase and cellulase (units mL-1). For comparative study, the biological activity of standard antibiotic Nystatin was also measured. Crude ethyl acetate extract of Padina gymnospora and methanolic extract of codium fragile exhibited strong activity against most of the tested fungi. All the tested fungi were sensitive to Nestatin, except F. oxysporium (the most resistant fungi), where the dry weight recorded from 68 to 69%, protein recorded 69 to 52%, pectinase and cellulase activity 62 to 58% of control. The most sensitive fungi were U. botrytis where the dry weight, protein content, pectinase and cellulase activities all were completely inhibited in cellulose and pectin media. While, the most active algae is the ethyl acetate extract of P. gymnospora and methanolic extract of C. fragile. inhibited pectinase and cellulase enzymes activities for all the tested fungi except A. brassicicola and F. oxysporium. This report confirms the broad antifungal effect of C. fragile using the methanolic extracts rather than ethyl acetate (P. gymnospora). Additionally, These Egyptian seaweeds, therefore, considered as a potential source for treating infections caused by the tested plant fungi.

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