Journal
JOURNAL OF ENVIRONMENTAL SCIENCES
Volume 26, Issue 12, Pages 2508-2516Publisher
SCIENCE PRESS
DOI: 10.1016/j.jes.2014.05.031
Keywords
Heavy metal; Phytoremediation; Lipid peroxidation; Antioxidant defense; Translocation factor
Categories
Funding
- National Natural Science Foundation of China [41271332]
- Natural Science Foundation of Hunan province [11JJ2031]
- Science and Technology Planning Project of Hunan Province, China [2012SK2021]
- College of Resources and Environmental Science (Hunan Normal University)
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Boehmeria nivea (L.) Gaud. is a potential candidate for the remediation of Cd contaminated sites. The present investigation aims to explore Cd tolerance threshold and to quickly identify the role of exogenous organic acids in Cd uptake and abiotic metal stress damage. Elevated Cd levels (0-10 mg/L) resulted in an obvious rise in Cd accumulation, ranging from 268.0 to 374.4 in root and 25.2 to 41.2 mg/kg dry weight in shoot, respectively. Citric acid at 1.5 mmol/L significantly facilitated Cd uptake by 26.7% in root and by 1-fold in shoot, respectively. Cd translocation efficiency from root to shoot was improved by a maximum of 66.4% under 3 mmoVL of oxalic acid. Citric acid exhibited more prominent mitigating effect than oxalic acid due to its stronger ligand affinity for chelating with metal and avoiding the toxicity injury of free Cd ions more efficiently. The present work provides a potential strategy for efficient Cd remediation with B. nivea. (c) 2014 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.
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