植物体内自由基清除剂抗坏血酸研究进展

抗坏血酸(Ascorbic Acid,AsA)作为植物体内一种重要的自由基清除剂，在减少膜脂过氧化作用对细胞造成的损伤、增强植物抵抗逆境胁迫能力等过程中起着非常重要的作用。通过分析比较AsA的生物合成途径，总结AsA参与细胞分裂与伸长、作为辅酶参与细胞壁的形成、光保护作用、作为电子传递与信号转导的载体等生理功能，系统阐述AsA在植物逆境胁迫（主要包括温度胁迫、盐胁迫、生物胁迫等）中的保护机制及功能，强调AsA研究对于了解自由基清除剂在植物抗逆性作用以及清除自由基机理方面具有重要作用。本研究提出在牧草种子劣变方面AsA研究的不足，并分析展望了AsA研究发展的趋势。

Research progress on ascorbic acid in plants

As a kind of important free radical scavenger in plants, ascorbic acid (AsA) plays a very important role in reducing the damage to cells which caused by membrane lipid peroxidation, and enhancing the ability of plants to resist the adversity stresses. In this study, the biosynthetic pathway of AsA was analyzed and compared, and summary was made on the physiological function of AsA, including its effects on cell division and elongation, involved in cell wall formation as a coenzyme, its light protective effects, and as carrier in electron transfer and signal transduction. The protection mechanism and function of AsA in plants adversity stress (temperature stress, salt stress, biological stress, etc.) were systematically elaborated. Researches on AsA are important for researchers to acquaint with the effects of free radical scavenger on plant resistance function, and the mechanism of free radical scavenging. Besides, the limitation of AsA study on grass seed deterioration was put forward, and the development trend of AsA study was also analyzed prospected in this study.