Journal
ENVIRONMENTAL POLLUTION
Volume 158, Issue 5, Pages 1710-1715Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2009.11.027
Keywords
Chelating agents; Heavy metals; Phytotoxicity; Pseudometallophytes; Transpiration
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Funding
- Spanish Ministry of Science and Technology
- Basque Government [ETORTEK- BERRILUR-III-IE09-242]
- UPV/EHU-GV [IT-299-07]
- MEC [BFU2007-62637/BFI]
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Two common sorrel (Rumex acetosa) accessions, one from a Zn-Pb contaminated site (CS accession) and the other from an uncontaminated site (UCS accession), were hydroponically exposed to a mixture of heavy metals (Pb2+ + Zn2+ + Cd2+) with and without EDTA at an equimolar rate. The metallicolous CS accession showed a higher tolerance to metal treatment in the absence of the chelating agent, whereas the UCS accession was especially tolerant to EDTA treatment alone. Combination of metal and EDTA treatment resulted in a higher Pb accumulation in shoots of both accessions although plants hardly showed phytotoxic symptoms. Cd and Zn uptake was not augmented by EDTA addition to the polymetallic medium. Chelant-assisted Pb accumulation was 70% higher in the CS accession than in the UCS accession, despite the fact that the former accession evapotranspired less water than the UCS accession. These results support the existence of a non-selective apoplastic transport of metal chelates by R. acetosa roots, not related to transpiration stream. (C) 2009 Elsevier Ltd. All rights reserved.
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