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Extracellular proteases from Streptomyces phaeopurpureus ExPro138 inhibit spore adhesion, germination and appressorium formation in Colletotrichum coccodes

Authors

  • S.A. Palaniyandi,

    1. Center for Nutraceutical and Pharmaceutical Materials, Myongji University, Yongin, Gyeonggi-Do,, Korea
    2. Division of Bioscience and Bioinformatics, College of Natural Science, Myongji University, Yongin, Gyeonggi-Do,, Korea
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  • S.H. Yang,

    1. Center for Nutraceutical and Pharmaceutical Materials, Myongji University, Yongin, Gyeonggi-Do,, Korea
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  • J.-W. Suh

    Corresponding author
    1. Division of Bioscience and Bioinformatics, College of Natural Science, Myongji University, Yongin, Gyeonggi-Do,, Korea
    • Center for Nutraceutical and Pharmaceutical Materials, Myongji University, Yongin, Gyeonggi-Do,, Korea
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Correspondence

Joo-Won Suh, Division of Bioscience and Bioinformatics, College of Natural Science, Myongji University, Cheoin-gu, Yongin, Gyeonggi-Do 449-728, Korea.

E-mail: jwsuh@mju.ac.kr

Abstract

Aim

To study the antifungal mechanism of proteases from Streptomyces phaeopurpureus strain ExPro138 towards Colletotrichum coccodes and to evaluate its utilization as biofungicide.

Methods and Results

We screened proteolytic Streptomyces strains from the yam rhizosphere with antifungal activity. Forty proteolytic Streptomyces were isolated, among which eleven isolates showed gelatinolytic activity and antagonistic activity on C. coccodes. Of the 11 isolates, protease preparation from an isolate designated ExPro138 showed antifungal activity. 16S rDNA sequence analysis of the strain showed 99% similarity with Streptomyces phaeopurepureus (EU841588.1). Zymography analysis of the ExPro138 culture filtrate revealed that the strain produced several extracellular proteases. The protease preparation inhibited spore germination, spore adhesion to polystyrene surface and appressorium formation. Microscopic study of the interaction between ExPro138 and C. coccodes revealed that ExPro138 was mycoparasitic on C. coccodes. The protease preparation also reduced anthracnose incidence on tomato fruits compared with untreated control.

Conclusion

This study demonstrates possibility of utilizing antifungal proteases derived from antagonistic microbes as biofungicide.

Significance and Impact of the Study

Microbial proteases having the ability to inhibit spore adhesion and appressorium formation could be used to suppress infection establishment by foliar fungal pathogens at the initial stages of the infection process.

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