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中国油料作物学报 ›› 2019, Vol. 41 ›› Issue (5): 773-.doi: 10.19802/j.issn.1007-9084.2018242

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Distribution and aflatoxin contamination by Aspergillus flavus in peanut from the southwest China

  

  1. 1. Oil Crops Research Institute of the Chinese Academy of Agricultural Sciences, Wuhan 430062, China;
     2. Laborato?ry of Risk Assessment for Oil seeds Products (Wuhan), Wuhan 430062, China; 
    3. Key Laboratory of Detection for My?cotoxins, Ministry of Agriculture and Rural Affairs, Wuhan 430062, China; 
    4. National Agricultural Testing Bench?mark Laboratory (Biotoxin), Wuhan 430062, China; 
    5. Key Laboratory of Biology and Genetic Improvement of Oil Crops, Ministry of Agriculture and Rural Affairs, Wuhan 430062, China; 
    5. Key Laboratory of Biology and Genetic Improvement of Oil Crops, Ministry of Agriculture and Rural Affairs, Wuhan 430062, China
  • Online:2019-10-28 Published:2019-12-20

Abstract:

To investigate the distribution, toxigenicity of Aspergillus flavus and aflatoxin contamination in pea?nut at post-harvest in southwest region in China, a total of 206 A. flavus strains were isolated from 177 peanut and soil samples from Guangnan in Yunnan Province (YNGN), Chayu in Tibet (XZCY), Peng’an in Sichuan Province (SCPA). Among them, 71 post-harvest peanut samples in these regions were evaluated on their aflatoxin levels. Re? sults showed that detection rate (50%) and colony number (212.0 CFU/g) in SCPA samples were both the highest, while those in XZCY (18.1%, 52.8 CFU/g respectively) were the lowest. Among the strains, 88.6% were toxigenic.They mainly produced B group aflatoxins, especially AFB1 which was in 0-8500 μg/L. Their capability order was in
YNGN > XZCY > SCPA. The 11.4% A. flavus strains were atoxigenic, which were all from XZCY. The level of afla? toxin contamination in peanut at post-harvest in southwest region was low, only 5 of 71 (7.0%) samples were posi?tive with AFB1 content of 0-7.2 μg/kg (0-7.2 μg/kg from SCPA samples, 0-2.1 μg/kg from YNGN samples, and ze?ro from XZCY samples. Threfore, aflatoxin contamination of peanut in southwest China might had close relation? ships with the detection rate, colony number of A. flavus. Thus the higher the detection rate and the colony number, the more serious of the aflatoxin contamination in peanuts.

Key words: southwest region, peanut, Aspergillus flavus, distribution, toxigenicity, aflatoxin contamination