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Characterization of Ugandan Endemic Aspergillus Species and Identification of Non-Aflatoxigenic Isolates for Potential Biocontrol of Aflatoxins
Article

Cumulative Effects of Non-Aflatoxigenic Aspergillus flavus Volatile Organic Compounds to Abate Toxin Production by Mycotoxigenic Aspergilli

Southern Regional Research Center, USDA-ARS, New Orleans, LA 70124, USA
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Toxins 2022, 14(5), 340; https://doi.org/10.3390/toxins14050340
Received: 21 March 2022 / Revised: 11 May 2022 / Accepted: 12 May 2022 / Published: 13 May 2022
(This article belongs to the Special Issue Current Status and Challenges of Aflatoxin Biocontrol Strategies)
Previously, authors reported that individual volatile organic compounds (VOCs) emitted by non-aflatoxigenic Aspergillus flavus could act as a mechanism of biocontrol to significantly reduce aflatoxins and cyclopiazonic acid (CPA) produced by toxigenic strains. In this study, various combinations and volumes of three mycotoxin-reductive VOCs (2,3-dihydrofuran, 3-octanone and decane) were assessed for their cumulative impacts on four Aspergillus strains (LA1–LA4), which were then analyzed for changes in growth, as well as the production of mycotoxins, including aflatoxins, CPA and multiple indole diterpenes. Fungal growth remained minimally inhibited when exposed to various combinations of VOCs. No single combination was able to consistently, or completely, inhibit aflatoxin or CPA across all toxigenic strains tested. However, the combination of 2,3-dihydrofuran and 3-octanone offered the greatest overall reductions in aflatoxin and CPA production. Despite no elimination of their production, findings showed that combining VOCs produced solely by non-aflatoxigenic A. flavus still inhibited several agriculturally important mycotoxins, including B and G aflatoxins and CPA. Therefore, other VOC combinations are worth testing as post-harvest biocontrol treatments to ensure the prolonged effectiveness of pre-harvest biocontrol efforts. View Full-Text
Keywords: VOCs; biocontrol mechanism; aflatoxins; cyclopiazonic acid; indole diterpenes VOCs; biocontrol mechanism; aflatoxins; cyclopiazonic acid; indole diterpenes
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MDPI and ACS Style

Moore, G.G.; Lebar, M.D.; Carter-Wientjes, C.H. Cumulative Effects of Non-Aflatoxigenic Aspergillus flavus Volatile Organic Compounds to Abate Toxin Production by Mycotoxigenic Aspergilli. Toxins 2022, 14, 340. https://doi.org/10.3390/toxins14050340

AMA Style

Moore GG, Lebar MD, Carter-Wientjes CH. Cumulative Effects of Non-Aflatoxigenic Aspergillus flavus Volatile Organic Compounds to Abate Toxin Production by Mycotoxigenic Aspergilli. Toxins. 2022; 14(5):340. https://doi.org/10.3390/toxins14050340

Chicago/Turabian Style

Moore, Geromy G., Matthew D. Lebar, and Carol H. Carter-Wientjes. 2022. "Cumulative Effects of Non-Aflatoxigenic Aspergillus flavus Volatile Organic Compounds to Abate Toxin Production by Mycotoxigenic Aspergilli" Toxins 14, no. 5: 340. https://doi.org/10.3390/toxins14050340

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