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Antimicrobial activity in cultures of endophytic fungi isolated from Garcinia species
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Document Title
Antimicrobial activity in cultures of endophytic fungi isolated from Garcinia species
Author
Phongpaichit S, Rungjindamai N, Rukachaisirikul V, Sakayaroj J
Name from Authors Collection
Affiliations
Prince of Songkla University; Prince of Songkla University; Prince of Songkla University; National Science & Technology Development Agency - Thailand; National Center Genetic Engineering & Biotechnology (BIOTEC)
Type
Article
Source Title
FEMS IMMUNOLOGY AND MEDICAL MICROBIOLOGY
ISSN
0928-8244
Year
2006
Volume
48
Issue
14
Open Access
Bronze
Publisher
WILEY
DOI
10.1111/j.1574-695X.2006.00155.x
Format
Abstract
The aim of the present study was to screen for antimicrobial activity in endophytic fungi isolated from surface sterilized leaves and branches of five Garcillia plants, G. atroviridis, G. dulcis, G. mangostana, G. nigrolineata and G. scortechinii, found in southern Thailand. Fermentation broths from 377 isolated fungi were tested for antimicrobial activity by the agar diffusion method. Minimum inhibitory concentrations (MICs) were obtained for crude ethyl acetate extracts. Seventy isolates (18.6%) displayed antimicrobial activity against at least one pathogenic microorganism, such as Staphylococcus aureus, a clinical isolate of methicillin-resistant S. aureus, C. andida albicans and Cryptococcus neoformans. The results revealed that 6-10%, 1-2% and 18% of the crude ethyl acetate extracts inhibited both strains of S. aureus (MIC 32-512 mu g mL(-1)), Ca. albicans and Cr. neoformans (MIC 64-200 mu g ml(-1)), and Microsporum gypseum (MIC 2-64 mu g mL(-1)), respectively. Isolates D15 and M76 displayed the strongest antibacterial activity against both strains of S. aureus. Isolates M76 and N24 displayed strong antiftingal activity against M. gypseum. Fungal molecular identification based on internal transcribed spacer rRNA gene sequence analysis demonstrated that isolates D15 (DQ480353), M76 (DQ480360) and N24 (DQ480361) represented Phomopsis sp., Botryosphaeria sp. and an unidentified fungal endophyte, respectively. These results indicate that some endophytic fungi from Garcinia plants are a potential source of antimicrobial agents.
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WOS