STUDIES REGARDING THE CHELATE-INDUCED HYPERACCUMULATION OF CU AND FE USING LOLIUM PERENNE SPECIES IN MINING AREAS
Keywords:
chelate-induced hyperaccumulation, Cu, Fe, Lolium perenneAbstract
The plant capacity to absorb high amounts of metal for a short period of time is the
major factor that influences the efficiency of phytoextraction. The
hyperaccumulating plants uptake high amounts in their tissues correlated to the
metal concentrations in soil. Chelating agents have the capacity to induce the metal
accumulation in biomass. They increase metal bioavailability for plants by releasing
the metal in accessible forms. The present study emphasizes that in the case of EDTA
use, the obtained biomass is smaller compared to the other variants, showing a
lower tolerance to this chelating agent of Lolium perenne species. Cu and Fe
phytoextraction by Lolium perenne species is higher in the case of EDTA use. Cu
bioaccumulation has higher values in variants with compost-sterile mixture ratio of
1:4 in comparison with Fe. In the case of the best compost-sterile mixture ratio of
1:3 the highest biomass is obtained in all the variants, biosolids’ effect being
stronger compared to the chelating agent.
References
Barcelo J., Poschenrieder C., 2003, Phytoremediation: principles and
perspectives. Contributions to science, 2(3):333-344, Barcelona.
Bradshaw, A.D., 1990, The reclamation of derelict land and the ecology of
ecosystems. In Restoration ecology: A synthetic approach to ecological research.
Edited by W.R. Jordan, M.E. Gilpin, and J.D. Aber. Cambridge University Press,
Cambridge, U.K. pp. 53–74.
Lasat M.M., 2002, Phytoextraction of toxic metals: a review of biological
mechanisms, J. Environment. Qual. 31, 109-120.
Prasad, M.N.V., de Oliviera Freitos, H.M., 2003, Metal hyperaccumulation
in plants – Biodiversity prospecting for phytoremediation technology, Journal of
Biotech. Vol. 6, no. 3.
Rate W., K. M. Lee, P. A. Freuch., 2004, Application of biosolids in
mineral sands mine reabilitation use of stockpiled topsolil decreases trace element
uptake by plants, Bioresource Technology, 91, p 223 – 231.
