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The biodiversity of Aspergillus flavus in stored rice grain leads to a decrease in the overall aflatoxin B1 production in these species

文献类型： 外文期刊

作者： Tan, Song 1 ; Ma, Fang 2 ; Wu, Yajie 1 ; Xu, Yuancheng 1 ; Niu, Ajuan 1 ; Chen, Yuping 1 ; Wang, Guangyu 1 ; Qiu, Weifen 1 ;

作者机构： 1.Nanjing Univ Finance & Econ, Coll Food Sci & Engn, Nanjing 210023, Peoples R China

2.Jiangsu Acad Agr Sci, Inst Vet Immunol & Engn, Natl Res Ctr Engn & Technol Vet Biol, Jiangsu Key Lab Food Qual & Safety,State Key Lab C, Nanjing 210014, Peoples R China

3.Nanjing Univ Finance & Econ, Collaborat Innovat Ctr Modern Grain Circulat & Saf, Nanjing 210023, Peoples R China

4.Nanjing Univ Finance & Econ, Key Lab Grains & Oils Qual Control & Proc, Nanjing 210023, Peoples R China

关键词： Aspergillus flavus; Aflatoxin B 1; Inter-simple sequence repeats (ISSR); Biodiversity; Grain depot

期刊名称：INTERNATIONAL JOURNAL OF FOOD MICROBIOLOGY （ 影响因子：5.4； 五年影响因子：5.5 ）

ISSN： 0168-1605

年卷期： 2023 年 406 卷

页码：

收录情况： SCI

摘要： Aspergillus flavus is a significant fungus that poses a threat to food safety by producing mycotoxins in various crops. In this study, A. flavus isolates were obtained from storage rice collected from seven provinces in southern China, and their AFB1 production, biosynthesis genes presence, and diversity were detected. Results showed that 56 out of the 81 A. flavus isolates produced detectable levels of AFB1, and 71 isolates (87.6 %) possessed aflR gene in their AF synthesis gene cluster, while only 41 isolates (50.6 %) had the ver-1 gene present. Genetic diversity analysis using inter-simple sequence repeats (ISSR) markers revealed seven main clusters among the isolates and the genetic similarity coefficients of 81 A. flavus isolates ranged from 0.53 to 1.00. Additionally, coculture assays were conducted using two toxigenic and two atoxigenic isolates from the same grain depot to investigate the effect of intraspecific inhibition on AFB1 production and to assess the AFB1 contamination risk of storage rice. The in situ results demonstrated that the atoxigenic isolates effectively inhibited the AFB1 contamination of toxigenic isolates. These findings provide insight into the genetic diversity of A. flavus isolates populations and highlight the potential food safety hazards of them in stored rice grain in China.

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