We investigated the effects on physiological response, trace elements and nutrients accumulation of sunflower plants grown in soil contaminated with: 5 mg kg−1 of Cd; 5 and 300 mg kg−1 of Cd and Zn, respectively; 5, 300, and 400 mg kg−1
of Cd, Zn, and Cu, respectively. Contaminants applied did not produce large effects on growth, except in Cd-Zn-Cu treatment in which leaf area and total dry matter were reduced, by 15%. The contamination with Cd alone did not affect neither growth nor physiological parameters, despite considerable
amounts of Cd accumulated in roots and older leaves, with a high bioconcentration factor from soil to plant. By adding Zn and then Cu to Cd in soil, significant were the toxic effects on chlorophyll content and water relations due to greater accumulation of trace elements in tissues, with
imbalances in nutrients uptake. Highly significant was the interaction between shoot elements concentration (Cd, Zn, Cu, Fe, Mg, K, Ca) and treatments. Heavy metals concentrations in roots always exceeded those in stem and leaves, with a lower translocation from roots to shoots, suggesting
a strategy of sunflower to compartmentalise the potentially toxic elements in physiologically less active parts in order to preserve younger tissues.
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Document Type: Research Article
Department of Crop Systems, Forestry and Environmental Sciences,University of Basilicata, Viale dell’Ateneo Lucano 10Potenza, Italy
University of Natural Resources and Life Sciences, ViennaDepartment of Forest and Soil Sciences, Peter Jordan Straβe 82Vienna, Austria
Publication date: April 1, 2012