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螯合剂对重金属超量积累植物Thlaspi caerulescens的锌、铜、锰和铁吸收的影响

沈振国, 刘友良, 陈怀满

中科院南京土壤研究所土壤圈物质循环开放研究实验室.江苏,南京 210008；南京农业大学农业部作物生长调控重点开放实验室.江苏,南京 210095

摘要

由螯合剂EDTA和DTPA对重金属超量积累植物Thlaspi caerulescens吸收Zn、Cu、Mn、Fe和P的影响表明:营养液含Zn 10#mu#mol/L条件下,植株地上部全Zn含量和根系吸Zn速率分别达到1 681mg kg~(-1)干重和448 mg kg~(-1)根干重d~(-1);43.2#mu#mol/L的EDTA或DTPA处理显著抑制植株的生长,也减少植株单位根重吸收的Zn量,降低地上部和根系全Zn、全Cu、全Mn含量和可溶态含量,增加地上部的全Fe和全P含量;所有处理中地上部全Zn和可溶态Zn含量均明显高于根系,说明T. caerulescens吸收的Zn大部分运向地上部。与Fe(III)EDTA处理相比,Fe(III)EDDHA处理植株的单位根重吸收Zn总量和地上部全Zn含量均较高。

关键词： 重金属超量积累植物; EDTA; DTPA; 锌吸收; 铁螯合物

Effects of chelators EDTA and DTPA on the uptake of zinc, copper, manganese and iron by hyperaccumulator Thlaspi caerulescens

Shen Zhenguo, Liu Youliang, Chen Huaiman

Laboratory of Material Cycling in Pedosphere, Institute of Soil Science,Chinese Academy of Sciences.Nanjing 210008,Jiangsu；China

Abstract

Effects of EDTA and DTPA on the uptake of Zn, Cu, Mn, Fe and P by hyperaccumulator Thlaspi caerulescens J. & C. Presl were investigated in solution culture experiments. Under Zn 10#mu#mol/L treatment condition, EDTA or DTPA 43.2#mu#mol/L was added to nutrient solutions. The results showed that EDTA or DTPA treatment inhibited significantly the growth of T. caerulescens and decreased dry weight of shoots and roots. Rate of Zn uptake per unit weight of root, the concentrations of total and water-soluble Zn, Cu, and Mn in the shoots and roots were decreased significantly by treatment with EDTA or DTPA, and the concentrations of total Fe and P in the shoots were increased.

Key words: Hperaccumulator;EDTA;DTPA;Zn uptake;Fe-chelator

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引用本文：

沈振国, 刘友良, 陈怀满. 螯合剂对重金属超量积累植物Thlaspi caerulescens的锌、铜、锰和铁吸收的影响[J]. 生理学报 1998; 50 (4): .

Shen Zhenguo, Liu Youliang, Chen Huaiman. Effects of chelators EDTA and DTPA on the uptake of zinc, copper, manganese and iron by hyperaccumulator Thlaspi caerulescens. Acta Physiol Sin 1998; 50 (4): (in Chinese with English abstract).