Abstract
Fusarium sporotrichioides, is a common soil-borne plant pathogen causing dry rot of potato in Northeast China. The objective of this study was to identify the main antifungal substances from Chaetomium globosum W7 against F. sporotrichioides. Strain W7 can significantly inhibit F. sporotrichioides without direct contact, suggesting that its antifungal substance was extracellular, and the solubility of this antifungal substance in ethyl acetate was superior to that in water. Acetone was selected as the optimum solvent for the extraction of the metabolites of C. globosum. Metabolites were then separated with thin-layer chromatography. Following antifungal tests on bands, a dark brown band with Rf value of 0.20 was determined as the antifungal substance, and identified as chaetoglobosin A. The antifungal activity test showed that the minimum inhibitory concentration of chaetoglobosin A to F. sporotrichioides was 9.45–10.50 μg/mL, IC50 being 4.344 μg/mL. Chaetoglobosin A also proved to have an excellent preventive effect on potato dry rot caused by F. sporotrichioides. To summarize, chaetoglobosin A was identified as the main active substance of C. globosum to inhibit F. sporotrichioides for the first time, and demonstrated a potential application value in agriculture.
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Acknowledgements
The authors wish to thank the Chinese government for the financial support of this study under the National High Technology Research and Development Program (2011AA10A205) and “Twelfth Five-Year Plan” National Science and Technology Program on Rural Area (2014BAL02B00).
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Jiang, C., Song, J., Zhang, J. et al. Identification and characterization of the major antifungal substance against Fusarium Sporotrichioides from Chaetomium globosum . World J Microbiol Biotechnol 33, 108 (2017). https://doi.org/10.1007/s11274-017-2274-x
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DOI: https://doi.org/10.1007/s11274-017-2274-x