数字农科院2.0

Herbicidal and Antibacterial Secondary Metabolites Isolated from the Nicotiana tabacum-Derived Endophytic Fungus Aspergillus japonicus TE-739D

文献类型： 外文期刊

作者： Haisu Wang;Xiaolong Yuan;Xinrong Huang;Peng Zhang;Gan Gu

作者机构：

关键词： antibacterial activity;Aspergillus japonicus;endophytic fungus;herbicidal activity;polyketides;secondary metabolites

期刊名称： Plants

ISSN： 2223-7747

年卷期： 2025 年 14 卷 2 期

页码：

收录情况： SCIE（2025版）

摘要： Endophytic fungi possess a unique ability to produce abundant secondary metabolites, which play an active role in the growth and development of host plants. In this study, chemical investigations on the endophytic fungus Aspergillus japonicus TE-739D derived from the cultivated tobacco (Nicotiana tabacum L.) afforded two new polyketide derivatives, namely japoniones A (1) and B (2), as well as four previously reported compounds 3–6. Their chemical structures were elucidated by detailed spectroscopic analyses and quantum chemical calculations. In the herbicidal assays on the germination and radicle growth of Amaranthus retroflexus L. and Eleusine indica seeds, compound 1 was found to inhibit the germ and radicle elongation. Notably, compound 2 showed potent herbicidal activity against A. retroflexus L. germ elongation, with an IC50 value of 43.6 μg/mL, even higher than the positive control glyphosate (IC50 = 76.0 μg/mL). Moreover, compound 4 demonstrated strong antibacterial effects against the pathogens Bacillus cereus and Bacillus subtilis, with a comparable MIC value of 16 μg/mL to the positive control chloramphenicol. These findings indicate that the endophytic fungus A. japonicus TE-739D holds significant metabolic potential to produce bioactive secondary metabolites, which are beneficial, providing survival value to the host plants.

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