Screening of Plants for the Phytoremediation of Zinc from Dir Lower, Khyber Pakhunkhwa, Pakistan
By: Muhammad Anwar Sajad, Muhammad Saleem Khan, Abdul Naeem, Hazrat Ali
Key Words: Phytoremediation, Phytoextraction, Phytostabilization, Zinc metal.
J. Bio. Env. Sci. 8(5), 206-218, May 2016.
Zinc can cause fatigue and dizziness. Its higher concentration induce observable toxicity symptoms in plant leaves as chlorosis and necrosis and reducing elongation of central root while promoting lateral roots formation. Changes in the concentration of macronutrients and reduction of water content in tissues are the other common toxicity effects of zinc. Ecological risk assessments often rely on toxicity thresholds for agronomic species, which may differ from those of restoration species. In the present research work sixty one wild plant species belongs to thirty families were collected and analyzed for the concentration of zinc metal. Present study was conducted to find out the uptake potential of zinc metal (Zn) of some plants grown in the research area and to screen plants for the phytoremediation of this metal.The total concentration of zinc in sixty one sites (soil), roots and shoots was found in the range of 3.07- 90.3, 10.13-56 and 3.87-90.9 mg/kg dry weight basis (DW) respectively. The highest zinc contents were present in the root of Medicago minima (L.) L. (56), Cerastium glomeratum Thuill. (50.2), Geranium rotundifolium L. (42.2) and in the shoot of Plantago lanceolata L. (90.9), Sanguisorba minor Scop. (79.8) as well as Erigeron canadensis L. (67.03). None of the plant species was identified as hyperaccumulator for zinc metal but based on Bioconcentration factors (BCFs), Translocation factors (TFs) and Bioaccumulation Coefficients (BACs) values most of the species showed feasibility for the phytoextraction and phytostabilization of zinc metal. Plantago lanceolata L., Sanguisorba minor Scop. and Erigeron canadensis L. are suggested for the phyto-extraction while Medicago minima (L.) L. and Cerastium glomeratum Thuill. are suggested for the phytostabilization of Zinc.