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Inhibitory effect of nerol against Aspergillus niger on grapes through a membrane lesion mechanism

机译:橙皮油膜膜损伤机理对黑曲霉的抑制作用

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The antifungal activity of Nerol (NEL) was evaluated against Aspergillus niger, a known cause of grape spoilage, and possible modes of action were explored. The antifungal efficacy of NEL against A. niger has been proven in a dose-dependent manner through in vitro (mycelial growth and spore germination) and in vivo (grapes) tests. An obvious increase in the membrane permeability was detected through the determination of extracellular pH and conductivity. The damage in the cell membrane was measured by monitoring the influx of Propidium iodide (PI) using flow cytometry and was further verified through the inhibition of ergosterol synthesis in the cell membrane. NEL induced morphological changes, and the integrity of the A. niger fungal cells decreased with increasing NEL concentrations. A dose-dependent decrease in ergosterol production was also seen in A. niger cell membranes upon exposure to NEL The mechanism-of-action study revealed that NEL activated a membrane-active mechanism that inhibits ergosterol synthesis and consequently compromised the membrane integrity of A. niger. As a result, the membrane permeability changes and causes cell death. The membrane lesion mechanism makes NEL a natural alternative to commercial fungicide for control of stored grape spoilage. (C) 2015 Elsevier Ltd. All rights reserved.
机译:评价了Nerol(NEL)对黑曲霉(一种已知的葡萄变质原因)的抗真菌活性,并探讨了可能的作用方式。通过体外(菌丝生长和孢子萌发)和体内(葡萄)测试以剂量依赖性的方式证明了NEL对黑曲霉的抗真菌功效。通过测定细胞外pH和电导率,发现膜通透性明显增加。通过使用流式细胞仪监测碘化丙啶(PI)的流入来测量细胞膜中的损伤,并通过抑制麦角固醇在细胞膜中的合成进一步证实。 NEL诱导了形态变化,黑曲霉真菌细胞的完整性随着NEL浓度的增加而降低。在暴露于NEL后,黑曲霉细胞膜中麦角固醇的产量也呈剂量依赖性下降。作用机理研究表明,NEL激活了一种抑制麦角固醇合成并因此损害A膜完整性的膜活性机制。尼日尔。结果,膜通透性改变并引起细胞死亡。膜损伤机制使NEL成为商业杀菌剂的天然替代品,可用于控制储存的葡萄变质。 (C)2015 Elsevier Ltd.保留所有权利。

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