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In vitro antifungal activity of antifungalmycin 702, a new polyene macrolide antibiotic, against the rice blast fungus Magnaporthe grisea

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Abstract

Antifungalmycin 702, a novel polyene macrolide antibiotic produced by Streptomyces padanus JAU4234, strongly inhibited mycelial growth of the rice blast fungus, Magnaporthe grisea, with EC50 of 37 μg/ml and EC90 of 136 μg/ml. Significant reduction in the number of conidia was observed at above 20 μg/ml. Conidia germination and appressorium formation were also suppressed and were not viable with >40 μg/ml. When treated with antifungalmycin 702, hyphae morphology became irregular. Based on microscopic examination, antifungalmycin 702 may exert its antifungal activity by changing the structure of cell membranes and the cytoskeleton and interacting with the organelles. Antifungalmycin 702 thus has potential as a new fungicide in the treatment of rice blast disease.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (Grants No. 30960011 and 31071724), Natural Science Foundation of Jiangxi Province, China (Grants No. 2009GZN0030 and 2010GZN0037) and Key Technology R&D Program of Jiangxi Province, China (Grant No. 2007BN14002).

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Authors and Affiliations

  1. College of Bioscience and Bioengineering, Jiangxi Agricultural University, Nanchang, 330045, China

    Xiao-Rong Tu, Sai-Jin Wei, Lin Huang, Xun-Hang Li, Hui Lu & Guo-Quan Tu

  2. Key Laboratory of Synthetic Biology, Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, 300 Fenglin Road, Shanghai, 200032, China

    Zhi-Qiang Xiong

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  1. Zhi-Qiang Xiong
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  2. Xiao-Rong Tu
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  3. Sai-Jin Wei
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  4. Lin Huang
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  5. Xun-Hang Li
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  6. Hui Lu
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  7. Guo-Quan Tu
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Correspondence to Zhi-Qiang Xiong.

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Xiong, ZQ., Tu, XR., Wei, SJ. et al. In vitro antifungal activity of antifungalmycin 702, a new polyene macrolide antibiotic, against the rice blast fungus Magnaporthe grisea . Biotechnol Lett 35, 1475–1479 (2013). https://doi.org/10.1007/s10529-013-1229-z

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  • DOI: https://doi.org/10.1007/s10529-013-1229-z

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