Effect of EDTA on nickel (Ni) phytoremediation by rapeseed (Brassica napus L.)
Keywords:
Brassica napus, chelate, nickel, phytoremediation, translocation factorAbstract
Heavy metals should be removed in soil for the safety of the environment, and phytoremediation, which is the use of plants to remove contaminants from the environment, can be useful in rehabilitating polluted sites. Chelating agents such as ethylenediamine tetraacetic acid (EDTA) have been used in different situations in phytoremediation to enhance the extraction of heavy metals by plants from soil. A pot experiment was conducted in 2018 in a greenhouse at the University of Tabriz, Iran, to evaluate the role of EDTA (0, 0.5 and 1 mmol kg-1 soil) on the phytoremediation potential of rapeseed (Brassica napus L.) under Ni stress (0, 50, 100 and 200 mg kg-1 soil). Increasing Ni and EDTA concentration significantly decreased the root and shoot dry weight and grain yield of rapeseed. Ni concentration in different parts of rapeseed increased significantly due to high concentration of Ni. The Ni concentration was higher in root, shoot and grain of EDTA-treated plants as compared to untreated plants. The translocation factor and bio-concentration factor calculated for the EDTA-treated plants were increased compared to the non-treated plants. These results suggested that EDTA application might be a useful strategy for increasing phytoremediation of Ni from contaminated soils.
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