Differences in EDTA-assisted metal phytoextraction between metallicolous and non-metallicolous accessions of Rumex acetosa L. |
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Authors: | Oihana Barrutia Carlos Garbisu José Ignacio García-Plazaola |
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Institution: | a Department of Plant Biology and Ecology, University of the Basque Country/EHU, P. O. Box 644, E-48080 Bilbao, Spain b NEIKER-Tecnalia, Basque Institute of Agricultural Research and Development, c/ Berreaga 1, E-48160 Derio, Spain |
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Abstract: | 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. |
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Keywords: | Chelating agents Heavy metals Phytotoxicity Pseudometallophytes Transpiration |
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