植物络合素及其合酶在重金属抗性中的功能研究进展

编号 zgly0000311456

文献类型 期刊论文

文献题名 植物络合素及其合酶在重金属抗性中的功能研究进展

作者 冯保民  麻密 

作者单位 中国科学院植物研究所光合作用与环境分子生理学重点实验室 

母体文献 应用与环境生物学报 

年卷期 2003,9(6)

页码 657-661

年份 2003 

分类号 X503.23  Q945.78 

关键词 植物络合素  植物络合素合酶  重金属解毒机制  重金属抗性 

文摘内容 Under heavy metal stress, higher plants initiate a set of defense responses, among which biosynthesis of phytochelatins (PCs) is important. PCs are rich in cystein and biosynthesized by phytochelatin synthase. The chemical structure of PCs and their ability to form complexes with a large range of metal ions is clear. Up to now, these peptides are known to play an important role in both endogenous metal ion homeostasis and heavy metal ion detoxification. The mechanism of cadmium tolerance is illustrated in detail. A model of this mechanism suggested that the detoxification process of cadmium include such steps as PCs induction, transport of cadmium into the tonoplast, formation of the HMW-Cd-PCs complexes and sequestration in vacuole. At the same time, PCs also have other functions, such as detoxification of arsenic, protecting enzyme from metal ion inhibition and supplying metal ion as a cofactor to the enzyme potentially. However, a lot of questions about its biological function remain to be answered. In 1999, three independent labs isolated the genes encoding the PCs synthase. This breakthrough of plant heavy metal tolerance research gave us a chance to further study the heavy metal tolerance mechanism. All the results from the reserch of PCs have a ffreat application potential in phytoremidation。