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• 基础研究 •    下一篇

茶树精油对扩展青霉线粒体功能的影响研究

陈雪昱1,邹秀容2,韦莹莹1,许凤1,邵兴锋1   

  1. 1. 宁波大学
    2. 韶关学院
  • 收稿日期:2020-01-31 修回日期:2020-11-20 出版日期:2021-02-15 发布日期:2021-02-24
  • 通讯作者: 邵兴锋 E-mail:shaoxingfeng@nbu.edu.cn
  • 基金资助:
    国家自然科学基金

Effect of Tea Tree Oil on the Mitochondrial Function of Penicillium expansum

1, 1, 1, Xing-feng SHAO1   

  • Received:2020-01-31 Revised:2020-11-20 Online:2021-02-15 Published:2021-02-24
  • Contact: Xing-feng SHAO E-mail:shaoxingfeng@nbu.edu.cn

摘要: 为了揭示茶树精油(TTO)对果蔬采后病原真菌扩展青霉(Penicillium expansum)的抑菌作用机制,以TTO处理的P. expansum孢子、菌丝和线粒体为研究对象,测定真菌活性氧(ROS)积累及6种线粒体功能相关酶类的活性变化,并采用扫描电镜、透射电镜观察精油处理对线粒体形态和超微结构的影响。结果表明:TTO处理导致P. expansum线粒体发生严重的皱缩,干瘪,胞内有空泡状结构,线粒体基质流失,严重破坏了P. expansum的线粒体结构。同时TTO处理诱导了P. expansum孢子内ROS的大量积累,导致菌丝细胞内三磷酸腺苷(ATP)含量下降和三磷酸腺苷酶(ATPase)、柠檬酸合酶(CS)、异柠檬酸脱氢酶(ICDH)、α-酮戊二酸脱氢酶(α-KGDH)、苹果酸脱氢酶(MDH)和琥珀酸脱氢酶(SDH)活性下降,破坏了P. expansum的三羧酸循环(TCA)。结果表明TTO处理引起P. expansum孢子内ROS的积累,破坏菌丝体内的线粒体形态和超微结构,TCA循环和能量代谢异常。可见,线粒体功能的严重受损是TTO抑制P. expansum的重要机制。

关键词: 茶树精油, 扩展青霉, 活性氧, 线粒体

Abstract: In order to study the antifungal effect of tea tree oil (TTO) on the Penicillium expansum in postharvest fruits and vegetables, the mycelia and mitochondria of P. expansum were treated with TTO, and the accumulation level of reactive oxygen species (ROS) and the changes in activities of enzymes associated with mitochondrial function were then measured. Scanning electron microscope (SEM) and transmission electron microscope (TEM) were also used to observe the morphology and ultrastructure of mitochondria for evaluating TTO effect on mitochondria. The results showed that TTO treatment caused severe shrinking, drying, and vesicular mitochondria, along with loss of mitochondrial matrix. Meanwhile, TTO treatment induced a large amount of ROS accumulated in P. expansum spores, resulting in decreases in intracellular adenosine triphosphate (ATP) content and activities of several important enzymes, including citrate synthetase (CS), isocitrate dehydrogenase (ICDH), α-ketoglutarate dehydrogenase (α-KGDH), malic dehydrogenase (MDH), and succinodehydrogenase (SDH). Thus, the tricarboxylic acid cycle (TCA) of P. expansum was destroyed. This study showed that TTO treatment affected the structure and function of mitochondria in P. expansum, caused ROS highly accumulated, disrupted the TCA cycle of P. expansum, and eventually hinder the normal metabolism of mitochondria.

Key words: Tea Tree Oil (TTO), Penicillium expansum, reactive oxygen species, Mitochondria

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