The Role of Reactive Oxygen Species in the Ethylene Biosynthesis in Plants
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摘要: 大量的研究结果表明,活性氧参与植物乙烯生物合成过程具有明显的普遍性,超氧阴离子自由基是参与乙烯生物合成过程的主要活性氧.近年来研究的焦点主要从乙烯生物合成的关键调控酶ACC合酶及ACC氧化酶的酶活性、酶动力学特性、酶蛋白空间结构、酶基因表达水平等方面来阐明活性氧调控植物乙烯生物合成的机制.最新的研究表明:植物在各种正常或应激的生长条件下首先诱导了活性氧产生水平的变化,活性氧在基因或蛋白质水平上影响ACC合酶和ACC氧化酶的活性水平,从而调节乙烯的生物合成.本文首次综述了活性氧影响植物乙烯生物合成过程的最新研究进展,并对活性氧在植物乙烯生物合成中具有诱导与抑制并存的"双重性"作用进行了探讨.Abstract: Significat evidence indicates that the involvement of reactive oxygen species(ROS) in the ethylene biosynthesis is a general process,and superoxide radical as a kind of ROS participates mainly in the ethylene biosynthesis.The recent study focuses on the effect of ROS on the key enzymes for ethylene biosynthesis,ACC synthase and ACC oxidase,concerning their activities,kinetics characteristics,protein structure,and their gene expression.ROS is firstly induced in normal growing process or under stress and then activities or genes expression of the two enzymes are regulated by the reactive oxygen species,which may result in the change in ethylene biosynthesis.The current advance in the role of ROS in ethylene biosynthesis in plants is reviewed in this paper.The dual role of ROS in ethylene biosynthesis is also discussed.
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Keywords:
- Ethylene /
- Reactive oxygen species /
- ACC synthase /
- ACC oxidase
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