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KMID : 0364820200560040361
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Korean Journal of Microbiology
2020 Volume.56 No. 4 p.361 ~ p.367
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Antifungal activity of Streptomyces strains against several toxigenic fungi
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Hwang Ji-Seon
Song Hong-Gyu
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Abstract
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In this study several antifungal activities of Streptomyces sporoverrucosus JS383 and S. lavendulae JS669 and antifungal substances produced by them against 10 kinds of toxigenic fungi were investigated. They produced large growth inhibitory zones (5.7~25.3 mm dia.) against target toxigenic fungi in the disc diffusion assay. JS383 and JS669 suppressed sporulation of all target fungi up to 97.3 and 99.2%, respectively, and also inhibited spore germination of most target fungi over 72.5%. They inhibited mycelial growth of toxigenic Aspergillus spp. significantly in a broth medium, and especially JS383 and JS669 completely suppressed the growth of A. flavus KACC45068 and KACC44986, respectively. Mycotoxin productions decreased significantly in these cultures, and JS383 and JS669 reduced the AFB1 production of A. flavus KACC45068 by 97.8% and 98.8%, respectively. JS383 and JS669 produced siderophore up to 113.2 and 110.2 μM, respectively, and showed the maximum chitinase activity of 1.4 U/ml as antifugal substances. These results suggest JS383 and JS669 strains and their metabolites may be used in a biological method to protect grains and feed against toxigenic fungi, and reduce economic and public health damage.
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KEYWORD
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Streptomyces, antifungal activity, antifungal substances, toxigenic fungi
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