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首页> 外文期刊>Biocontrol Science and Technology >A strain of Aspergillus flavus from China shows potential as a biocontrol agent for aflatoxin contamination
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A strain of Aspergillus flavus from China shows potential as a biocontrol agent for aflatoxin contamination

机译：来自中国的一株黄曲霉菌株显示出作为黄曲霉毒素污染的生物防治剂的潜力

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摘要

Aflatoxins are toxic and carcinogenic secondary metabolites produced by Aspergillus flavus and Aspergillus parasiticus. Strains of A. flavus that are non-aflatoxigenic (i.e., incapable of secreting aflatoxins) have proven effective in controlling contamination by these aflatoxin producing species in the field. In the present study, a non-aflatoxigenic A. flavus strain, GD-3, was isolated from a peanut field in Guangdong Province, China. Polymerase chain reaction (PCR) analysis showed that 12 aflatoxin biosynthesis genes (aflT, pksA, nor-1, fas-2, fas-1, aflR, aflJ, adhA, estA, norA, ver-1 and verA) were deleted in GD-3. Co-inoculation with a toxigenic strain, GD-15, at the ratio of 1: 10, 1: 1 or 10: 1 (GD-3: GD-15), showed that GD-3 was capable of reducing detectable aflatoxin levels on three different substrates. This reduction ranged from 33% to 99% and correlated with competitor ratio. These results demonstrated that GD-3 was successful at reducing aflatoxin contamination and showed promise as a potential agent of biocontrol for local farmers.
机译：黄曲霉毒素是由黄曲霉和寄生曲霉产生的有毒和致癌的次生代谢产物。已经证明非黄曲霉原性的黄曲霉菌株（即，不能分泌黄曲霉毒素）可有效控制田间这些产黄曲霉毒素的物种的污染。在本研究中，从中国广东省的花生田中分离出非黄曲霉黄曲霉菌株GD-3。聚合酶链反应（PCR）分析显示GD中删除了12种黄曲霉毒素生物合成基因（aflT，pksA，nor-1，fas-2，fas-1，aflR，aflJ，adhA，estA，norA，ver-1和verA） -3。以1：10、1：1或10：1（GD-3：GD-15）的比例与产毒菌株GD-15共同接种，表明GD-3能够降低可检测到的黄曲霉毒素水平。三种不同的基材。下降幅度为33％至99％，并与竞争者比例相关。这些结果表明，GD-3在减少黄曲霉毒素污染方面取得了成功，并有望成为当地农民进行生物防治的潜在手段。

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