With the aim of screening more bioactivity metabolites, in this study, two new indole alkaloids, felisindoles A and B (1 and 2), were isolated from the cigar tobacco-derived endophytic fungi Aspergillus felis. Their structures were determined by means of HR-ESI-MS and extensive 1D and 2D NMR spectroscopic data. Interestingly, the anti-fungi activity assay revealed that compounds 1 and 2 showed potential anti-G. cichoracearum (the main pathogen of tobacco powdery mildew disease) activity with inhibition rates of 72.6% ± 5.2, and 61.7% ± 5.0, respectively, compared to the negative control. However, these rates are lower than that of the positive control (with an inhibition rate of 93.2% ± 5.5).
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Acknowledgment
This project was supported by the Foundation of the China Tobacco Monopoly Bureau Grants and Yunnan Provincial Tobacco Monopoly Bureau Grants (2021530000241002), the National Natural Science Foundation of China (No. 32260111), the Foundation of Yunnan Innovative Research Team (2019HC020), and the Foundation for Key Laboratory of Yunnan Provincial Department of Education (2022HD021).
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Published in Khimiya Prirodnykh Soedinenii, No. 6, November–December, 2023, pp. 955–958.
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Kong, LW., Qiu, WY., Chen, MS. et al. Two New Antifungal Indole Alkaloids from an Endophytic Fungi Aspergillus felis Obtained from Cigar Tobacco. Chem Nat Compd 59, 1132–1136 (2023). https://doi.org/10.1007/s10600-023-04210-5
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DOI: https://doi.org/10.1007/s10600-023-04210-5