中文摘要：

应用有机酸辅助植物修复重金属污染以提高修复效率逐渐成为治理重金属污染的有效途径之一。采用溶液培养研究了外施乙二胺四乙酸（EDTA）和柠檬酸2种有机酸对黄菖蒲（Iris pseudacorus L．）Cd、Cu积累及生理特性的影响。结果表明：不同浓度的EDTA和柠檬酸均增加了黄菖蒲对Cd、Cu的吸收，且提高了其向地上部运输2种重金属的能力，其中，柠檬酸对黄菖蒲吸收cd的促进作用高于EDTA，EDTA对cu吸收的促进效果优于柠檬酸；不同浓度EDTA和柠檬酸对黄菖蒲生长及生理特性的影响有所差异，5mmol·L^-1的EDTA及0．5和5mmol·L^-1的柠檬酸均使黄菖蒲干质量较对照有不同程度的下降，膜脂过氧化产物MDA含量明显增加，而0．5mmol·L^-1的EDTA不仅增加了黄菖蒲对Cd、Cu的积累，降低了植物的膜脂过氧化程度，还在植物生长方面起到一定的积极作用。

英文摘要：

Applying organic acids to improve the efficiency of phytoremediation becomes an effective approach for the remedy of heavy metals- contaminated soils and waters. By the method of hydroponic culture, this paper studied the effects of EDTA and citric acid on the Cd- and Cu accumulation and physiological characteristics of Iris pseudacorus L. under Cd and Cu stresses. The results showed that EDTA and citric acid promoted the absorption of Cd and Cu by L pseudacorus, and enhanced the translocation of these two heavy metals from plant root to shoot. Citric acid had a higher promotion effect on the Cd absorption than EDTA, while EDTA promoted more Cu adsorption than citric acid. Different concentrations of EDTA and citric acid had different effects on the growth and physiological characteristics of L pseudacorus, e. g. , 5 mmol ·L^-1 of EDTA and 0. 5 and 5 mmol ·L^-1 of citric acid decreased the dry mass of L pseudacorus to a certain extent and increased the malondialdehyde （MDA） content significantly, while 0.5 mmol·L^-1 of EDTA not only increased the Cd- and Cu accumulation and decreased the lipid peroxidation of L pseudacorus, but also played an active role in the plant growth.