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Transcriptomic and biochemical analyses revealed antifungal mechanism of trans-anethole on Aspergillus flavus growth

  • Genomics, Transcriptomics, Proteomics
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Applied Microbiology and Biotechnology Aims and scope Submit manuscript

Abstract

Plant volatile compounds have great potential for preventing and controlling fungal spoilage in post-harvest grains. Recently, we have reported the antifungal effects of trans-anethole, the main volatile constituent of the Illicium verum fruit, on Aspergillus flavus. In this study, the inhibitory mechanisms of trans-anethole against the growth of A. flavus mycelia were investigated using transcriptomic and biochemical analyses. Biochemical and transcriptomic changes in A. flavus mycelia were evaluated after exposure to 0.2 μL/mL trans-anethole. Scanning electron microscopy showed that trans-anethole treatment resulted in the surface wrinkling of A. flavus mycelia, and calcofluor white staining confirmed that trans-anethole treatment disrupted the mycelial cell wall structure. Annexin V-fluorescein isothiocyanate/propidium iodide double staining suggested that trans-anethole induced apoptosis in A. flavus mycelia. Reduced mitochondrial membrane potential and DNA damage were observed in trans-anethole-treated A. flavus mycelia using 5,5′,6,6′-tetrachloro-1,1′,3,3′-tetraethyl-imidacarbocyanine and 4′,6-diamidino-2-phenylindole staining, respectively. 2′,7′- Dichloro-dihydro-fluorescein diacetate staining and biochemical assays demonstrated that trans-anethole treatment cause the accumulation of reactive oxygen species in the A. flavus mycelia. Transcriptome results showed that 1673 genes were differentially expressed in A. flavus mycelia exposed to trans-anethole, which were mainly associated with multidrug transport, oxidative phosphorylation, citric acid cycle, ribosomes, and cyclic adenosine monophosphate signaling. We propose that trans-anethole can inhibit the growth of A. flavus mycelia by disrupting the cell wall structure, blocking the multidrug transport process, disturbing the citric acid cycle, and inducing apoptosis. This study provides new insights into the inhibitory mechanism of trans-anethole on A. flavus mycelia and will be helpful for the development of natural fungicides.

Key points

Biochemical analyses of A. flavus mycelia exposed to trans-anethole were performed

Transcriptomic changes in trans-anethole-treated A. flavus mycelia were analyzed

An inhibitory mechanism of trans-anethole on the growth of A. flavus mycelia was proposed

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The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (grant number 31772023), Scientific and Technological Research Project of Henan Province (grant number 212102110193), Natural Scientific Research Innovation Foundation of Henan University of Technology (grant number 2020ZKCJ01), Cultivation Programme for Young Backbone Teachers in Henan University of Technology, and Key Scientific and Technological Project of Education Department of Henan Province(grant number 23A210007).

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JDL: Experimentation, Writing-original draft, Investigation. QL: Software, Visualization. SBZ: Supervision, Data curation, Writing-review & editing, Resources. YYL: Software, Visualization. HCZ: Methodology, Conceptualization. SW: Software, Visualization. PAM: Software, Visualization. YSH: Visualization, Conceptualization, Validation.

Corresponding author

Correspondence to Shuai-Bing Zhang.

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Lei, JD., Li, Q., Zhang, SB. et al. Transcriptomic and biochemical analyses revealed antifungal mechanism of trans-anethole on Aspergillus flavus growth. Appl Microbiol Biotechnol 107, 7213–7230 (2023). https://doi.org/10.1007/s00253-023-12791-y

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  • DOI: https://doi.org/10.1007/s00253-023-12791-y

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