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Zinc accumulation potential and toxicity threshold determined for a metal-accumulating Populus canescens clone in a dose–response study
Authors:Ingrid Langer  Doris Krpata  Walter J. Fitz  Walter W. Wenzel  Peter F. Schweiger
Affiliation:1. Institute of Soil Science, University of Natural Resources and Applied Life Sciences, Peter Jordan-Straße 82, A-1190 Vienna, Austria;2. Institute of Microbiology, Innsbruck University, Technikerstraße 25, A-6020 Innsbruck, Austria;1. BioLabs, Life Sciences Institute, Scuola Superiore Sant’Anna, Piazza Martiri della Libertà 33, I-56127 Pisa, Italy;2. Department of Crop Biology, University of Pisa, Via del Borghetto, 80, I-56124 Pisa, Italy;3. Department of Biosciences and Territory, University of Molise, Contrada Fonte Lappone, I-86090 Pesche, Italy;4. The EFI Project Centre on Mountain Forests (MOUNTFOR), Via Edmund Mach 1, I-38010 San Michele all’Adige, Italy;1. Department of Physics, School of Science, East China University of Science & Technology, Shanghai 200237, China;2. Key Laboratory of Luminescence and Optical Information, Ministry of Education, Institute of Optoelectronic Technology, Beijing Jiaotong University, Beijing 100044, China;3. Kunshan Hisense Electronics, Co., Ltd., Kunshan, Jiangsu 215300, China;1. Escuela de Agronomía, Pontificia Universidad Católica de Valparaíso, Casilla 4-D, Quillota, Chile;2. Departamento de Ecosistemas y Medio Ambiente (DEMA), Facultad de Agronomía e Ingeniería Forestal, Pontificia Universidad Católica de Chile, Santiago, Chile;3. Center of Applied Ecology and Sustainability (CAPES), Pontificia Universidad Católica de Chile, Santiago, Chile;4. Department of Chemistry, Université de Montréal, Montréal, QC, Canada H3C 3J7;1. Departamento de Electromagnetismo y Electrónica, Universidad de Murcia, Murcia, Spain;2. European Space Agency, ESA/ESTEC Scientific Support Office, Directorate of Science, Noordwijk, The Netherlands;3. Geomática, Teledetección y SIG Aplicados, Universidad Católica de San Antonio, Murcia, Spain;4. Instituto de Astrofísica de Andalucía, IAA-CSIC, Granada, Spain
Abstract:The effect of increasing soil Zn concentrations on growth and Zn tissue concentrations of a metal-accumulating aspen clone was examined in a dose–response study. Plants were grown in a soil with a low native Zn content which was spiked with Zn salt solutions and subsequently aged. Plant growth was not affected by NH4NO3-extractable soil Zn concentrations up to 60 μg Zn g?1 soil, but it was completely inhibited at extractable concentrations above 90 μg Zn g?1 soil. From these data an effective concentration of 68.5 μg extractable Zn g?1 soil was calculated at which plant growth was reduced by 50%. The obtained information on toxicity threshold concentrations, and the relation between plant Zn accumulation and extractable soil Zn concentrations may be used to assess the suitability of the investigated Populus canescens clone for various phytoremediation strategies. The potential risk of metal transfer into food webs associated with P. canescens stands on Zn-polluted sites may also be estimated.
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