%0 Journal Article
%T Phytochelatin and its function in heavy metal tolerance of higer plants<br>植物螯合肽及其在重金属耐性中的作用
%A WU Feibo
%A ZHANG Guoping
%A <br>邬飞波
%A 张国平
%J 应用生态学报
%D 2003
%I 
%X The biosynthesis pathway of phytochelatins (PC) and its function in heavy metal tolerance of higher plants were summarized in this paper. The toxic heavy metal accumulation in soil would deteriorates crop growth and yield components, and threaten the agro-products security. There were significantly differences in the accumulation and tolerance to heavy metals among plant species and genotypes. The formation of PC in response to the stress caused by heavy metals was one of the truly adaptive responses occurred commonly in higher plants. In the heavy metal tolerant genotypes, there was a much higher accumulation of PC than the non-tolerant lines. Glutathione (GSH) was the substrate for the synthesis of PC, which chelated the metals. The inactive toxic metal ions of metal-PC chelatins were subsequently transported from cytosol to vacuole before they could poison the enzymes of life-supporting metabolic routes, and transiently stored in vacuole to reduce the heavy metal concentration in cytosol, thus, heavy metal detoxification was attained. The break through of genetic mechanism and bio-chemical pathway of PC synthesis induced by heavy metals would depend on the further study on molecular biology in this field. The isolation of Cd-sensitive cad1 and cad2 mutants of Arabidopsis thaliana, that was deficient in PC, demonstrted the importance of PC for heavy metal tolerance. The effect of PC on food security and on phytoremediation of soil and water contaminated by heavy metals was also discussed in this paper.
%K Heavy metal
%K Phytochelatin
%K Molecular biology
%K Tolerance<br>重金属
%K 植物螯合肽
%K 分子生物学
%K 耐性
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=90BA3D13E7F3BC869AC96FB3DA594E3FE34FBF7B8BC0E591&jid=42FEDDFE54F8BCD9D5FD1926ABDD7722&aid=B8BFD98557D74624&yid=D43C4A19B2EE3C0A&vid=F3583C8E78166B9E&iid=E158A972A605785F&sid=7E2D9DFE40003B3F&eid=9BF3B0483F192149&journal_id=1001-9332&journal_name=应用生态学报&referenced_num=17&reference_num=68