Risk assessment of mycotoxins, the identification and environmental influence on toxin-producing ability of Alternaria alternate in the main Tibetan Plateau Triticeae crops

In order to find out the contamination of mycotoxins in crops of Qinghai-Tibet Plateau, a total of 153 crop fruits were collected as target samples, and 22 mycotoxins were tested. High detection rate was found in the mycotoxins, including tentoxin (TEN), tenuazonic acid (TEA) and alternariol (AOH) t...

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Published inFrontiers in microbiology Vol. 13; p. 1115592
Main Authors Wang, Jun, Zhang, Feilong, Yao, Ting, Li, Ying, Wei, Na
Format Journal Article
LanguageEnglish
Published Switzerland Frontiers Media S.A 07.02.2023
Subjects
Alternaria alternate
hull-less barley
Microbiology
mycotoxin
toxigenic capacity
Triticeae
hull-less barley
mycotoxin
toxigenic capacity
Alternaria alternate
Triticeae
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Summary:In order to find out the contamination of mycotoxins in crops of Qinghai-Tibet Plateau, a total of 153 crop fruits were collected as target samples, and 22 mycotoxins were tested. High detection rate was found in the mycotoxins, including tentoxin (TEN), tenuazonic acid (TEA) and alternariol (AOH) toxins. To further clarify the production rules of mycotoxins. A number of 9 high yield toxic strains were selected from 65 bacterial strains and the gene sequences of each were determined. The nine selected alternate were cultured under specific pH of the culture medium, temperature and ultraviolet (UV) irradiation, and their growth and toxicity were analyzed. The results showed that the toxic capacity of most increased with the increase of culture environment temperature and decreased with the increase of UV irradiation. However, the production of some toxins did not meet this principle, or even met the principle of relativity. In the culture experiments, a total of five toxins were detected as positive, which were TEN, AOH, alternariol monomethyl ether (AME), TEA, and (ALT). The altenusin (ALS) toxin was not detected in the metabolites of the nine strains. It indicated that the TEN, AOH, AME, TEA, and ALT toxins should be particularly valued in the future risk assessments. This finding provided comprehensive information of mycotoxins contamination in the Tibetan Plateau crops, it pointed out a direction to the Tibetan Plateau food crops' quality control.
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This article was submitted to Food Microbiology, a section of the journal Frontiers in Microbiology
These authors have contributed equally to this work and share first authorship
Edited by: Chao Shi, Northwest A&F University, China
Reviewed by: Shi-Wu Li, Shihezi University, China; Li Nan, Northwestern Polytechnical University, China
ISSN:1664-302X
1664-302X
DOI:10.3389/fmicb.2022.1115592