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植物的硫同化及其相关酶活性在镉胁迫下的调节
引用本文:孙雪梅,杨志敏. 植物的硫同化及其相关酶活性在镉胁迫下的调节[J]. 植物生理与分子生物学学报, 2006, 32(1): 9-16
作者姓名:孙雪梅  杨志敏
作者单位:南京农业大学生命科学学院生物化学与分子生物学系,南京,210095
摘    要:植物对土壤中硫的利用包括根系对硫酸盐的吸收、转运、同化、分配等过程,也是由一系列酶和蛋白质参与和调节的代谢过程。近年来的研究表明,在植物体内,硫同化与植物对镉等重金属元素的胁迫反应机制有着密切关系。镉胁迫能调节植物对硫酸盐的吸收、转运、同化,以及半胱氨酸、谷胱甘肽(glutathione,GSH)和植物螯合肽(Dhytochelatins,pc)的合成。植物在镉胁迫下通过多种调节机制,增强对硫酸盐的吸收和还原,迅速合成半胱氨酸和谷胱甘肽等代谢物,从而合成足够的PC,以满足植物生理的需要。

关 键 词:硫同化  调节酶  植物螯合肽  镉胁迫
收稿时间:2005-05-12
修稿时间:2005-05-122005-11-04

Plant Sulfate Assimilation and Regulation of the Activity of Related Enzymes under Cadmium Stress
SUN Xue-Mei,YANG Zhi-Min. Plant Sulfate Assimilation and Regulation of the Activity of Related Enzymes under Cadmium Stress[J]. Journal Of Plant Physiology and Molecular Biology, 2006, 32(1): 9-16
Authors:SUN Xue-Mei  YANG Zhi-Min
Affiliation:Department of Biochemistry and Molecular Biology, College of Life Sciences, Nanjing Agricultural University, Nanjing 210095, China
Abstract:The complexation and sequestration ofheavy metal ions (e.g. Cd) by the cysteine-richpolypeptides known as phytochelatins (PC) arethought to confer heavy metal hyperaccumulationand tolerance in some plant species. PC is synthe-sized enzymatically from glutathione. The tripep-tide glutathione is a product of primary sulfurmetabolism. A variety of enzymes or proteins areinvolved in sulfur assimilation including sulfatetransporters (STs), ATP sulfurylase (ATPS), APSreductase (APSR), sulfite reductase (SiR), glu-tathione synthetase (GS) and phytochelatin synthe-sis (PCS). These enzymes or proteins are upstream-regulated by Cd at either the metabolic or the ge-netic level under metal stress. Increasing evidenceshows that enhancement of sulfate uptake and re-duction occurs with the production of PC in plantsunder heavy metal stress. In this article, the keyaspects of our recent understanding of regulatorymechanisms involved in the relation between the sul-fate assimilation and phytochelatin synthesis aredescribed.
Keywords:sulfate assimilation   regulatory enzymes   phytochelatin   Cd stress
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