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首页> 外文期刊>Mycotoxin Research >Effect of temperature on growth, gene expression, and aflatoxin production by Aspergillus nomius isolated from Brazil nuts
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Effect of temperature on growth, gene expression, and aflatoxin production by Aspergillus nomius isolated from Brazil nuts

机译：温度对生长，基因表达和黄曲霉毒素的影响从巴西坚果中分离出来

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摘要

Aspergillus nomius is a potent producer of aflatoxins B and G and is one of the most common species of fungi found in Brazil nuts. Temperature is considered a major abiotic factor that influences fungal colonization and aflatoxin production in nuts during pre- and post-harvest. Therefore, assessment of the response of aflatoxigenic species to different temperatures is important to add information about the understanding of aflatoxin production by Aspergillus nomius and may help in the development of new strategies to prevent aflatoxin contamination. The aim of this study was to evaluate the effect of temperature (25, 30, and 35 degrees C) on the radial growth, aflatoxin production (B and G), and aflatoxin gene expression of seven A. nomius strains isolated from Brazil nuts. The optimal temperature for growth was 30 degrees C and was also the best condition for the expression of the aflR, aflD, and aflQ genes. However, maximum production of aflatoxins B and G occurred at 25 degrees C. Interestingly, high expression of the structural gene aflQ was observed in the maximum aflatoxin production condition (25 degrees C). The present study demonstrates that temperature may influence aflatoxin production by A. nomius. The combination of molecular and physiological data aids the understanding of the aflatoxigenic species response to different temperatures and can assist in predicting the driving environmental factors that influence aflatoxin contamination of Brazil nuts.
机译：Aspergillus Nomius是黄曲霉毒素B和G的强化生产商，是巴西坚果中发现的最常见的真菌之一。温度被认为是在收获前和收获后的螺母中影响真菌殖民和黄曲霉毒素的主要非生物因素。因此，对不同温度对不同温度的评估是重要的，可以添加有关aspergillus nomius的理解的信息，并有助于开发新的策略以防止黄曲霉毒素污染。本研究的目的是评估温度（25,30和35℃）对径向生长，黄曲霉毒素产生（B和G）的影响，以及从巴西坚果中分离的七个A. Nomius菌株的黄曲霉毒素基因表达。增长的最佳温度为30℃，也是AFLR，AFLD和AFLQ基因表达的最佳条件。然而，最大的黄曲霉毒素B和G的产生在25摄氏度下发生。有趣的是，在最大的黄曲霉毒素生产条件下观察到结构基因AFLQ的高表达（25℃）。本研究表明，温度可能影响A. Nomius的黄曲霉毒素。分子和生理数据的组合有助于了解去脱脂物种对不同温度的反应，并有助于预测影响巴西坚果的黄曲霉毒素污染的驾驶环境因素。

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