Effects of copper and cadmium on heavy metal polluted waterbody restoration by duckweed ( Lemna minor)

• Published in: Plant physiology and biochemistry 2007, Vol.45 (1), p.62-69
• Main Authors: Hou, Wenhua, Chen, Xiao, Song, Guanling, Wang, Qunhui, Chi Chang, Chein
• Format: Article
• Language: English
• Subjects: Antioxidant enzyme; Biological and medical sciences; Cadmium; Cadmium - toxicity; China; Copper; Copper - toxicity; Disinfection; Duckweed; Environmental Restoration and Remediation; Fresh Water; Fundamental and applied biological sciences. Psychology; Magnoliopsida - drug effects; Magnoliopsida - physiology; Photosynthetic pigment; Physiological diseases. Varia; Phytopathology. Animal pests. Plant and forest protection; Plant Proteins - drug effects; Plant Proteins - metabolism; Soluble protein; Water Pollutants, Chemical - toxicity
• ISSN: 0981-9428; 1873-2690
• DOI: 10.1016/j.plaphy.2006.12.005

Aquatic plants have been identified as a potentially useful group for accumulating and bioconcentrating heavy metals. In the study, we investigated changes in the contents of soluble protein and photosynthetic pigments as well as the activity of antioxidant enzymes caused by copper sulfate and cadmium dichloride, respectively in duckweed ( Lemna minor) during concentration-dependent exposure (0.05–20 mg l −1) to metal salt. The results demonstrated that exposure to high concentration heavy metals (Cu > 10 mg l −1, Cd > 0.5 mg l −1) could result the disintegration of antioxidant system in duckweed. Also, the significant decrease of contents of soluble protein and photosynthetic pigments was observed to high-level metal stress. Additionally, cadmium was found to be more toxic than copper on plants. The outcome of this study corroborate that Lemna minor is a suitable candidate for the phytoremediation of low-level copper and cadmium contaminated waterbody.