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首页> 外文期刊>Mycologia >Effect of competition and adverse culture conditions on aflatoxin production by Ashergillus flavus through successive generations
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Effect of competition and adverse culture conditions on aflatoxin production by Ashergillus flavus through successive generations

机译：竞争和不利培养条件对黄曲霉续生代产黄曲霉毒素的影响

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Strains of Aspergillus flavus often degenerate with serial transfers on culture media, resulting in morphological changes and loss of aflatoxin production. However, degeneration does not readily occur in nature as indicated by the wild-type morphological characters of newly isolated strains and the high percentage of aflatoxigenic A. flavus from soil and crops in some geographic regions. In this study, three aflatoxin-producing strains of A. flavus were serially transferred using conidia for 20 generations (three independent generation lines per strain) on potato dextrose agar at 30 C. The rate of degeneration was compared to that of cultures grown in the presence of competing fungi (A. terreus, Penicillium, funiculosum, and the yeast, Pichia guilliermondii) and under adverse conditions of elevated temperature, reduced water activity, low pH, and nutrient deprivation. Formation of morphological variants and the associated loss of aflatoxin production over generations varied considerably according to strain and the generation line within each strain. In the strain most sensitive to degeneration on potato dextrose agar, aflatoxin-producing ability was maintained to varying degrees under adverse culture conditions, but not when A. flavus was competing with other fungi. [References: 35]
机译：黄曲霉菌株通常在培养基上连续转移而退化，导致形态变化和黄曲霉毒素产生损失。然而，如新近分离出的菌株的野生型形态特征和某些地理区域的土壤和农作物中产生高含量黄曲霉黄曲霉所表明的那样，自然界中不容易发生变性。在这项研究中，使用分生孢子在30°C的马铃薯葡萄糖琼脂上连续分生了3株黄曲霉产黄曲霉菌株20代（每株三个独立世代系）。竞争性真菌（土曲霉，青霉，真菌和酵母毕赤酵母）的存在，以及在高温，水分活度降低，pH低和营养缺乏的不利条件下。形态变异的形成和黄曲霉毒素产量的相关损失在整个世代中随菌株和每个菌株内的世代而变化很大。在对马铃薯葡萄糖琼脂变性最敏感的菌株中，在不利的培养条件下黄曲霉毒素的生产能力保持不同程度，但当黄曲霉菌与其他真菌竞争时则没有。 [参考：35]

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