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Uptake, localisation and physiological changes in response to copper excess in Erica andevalensis

AuthorsRossini Oliva, S.; Mingorance, M. Dolores; Valdés, B.; Leidi, Eduardo O.
KeywordsErica andevalensis
Issue Date12-Aug-2009
CitationPlant and Soil 328(1-2): 411–420 (2010)
AbstractCopper uptake, localisation and biochemical and physiological traits were studied in hydroponically-grown Erica andevalensis plants at different increasing concentrations of Cu (1 μM, 50 μM, 100 μM, 250 μM, and 500 μM). Increasing Cu concentration in the nutrient medium led to a significative reduction in plant growth rate, an increase in root Cu concentration, leaf photosynthetic pigments and root peroxidase activity. Copper accumulation followed the pattern roots>stems>leaves, a typical behaviour of metal-excluders. Copper treatments led to significant changes in the free amino acid composition in shoots and roots and the concentration of polyamines in shoots. Analysis by scanning electron microscopy coupled with elemental X-ray analysis (SEM–EDX) showed a partial restriction of upward Cu transport by root vascular tissues. In leaf tissues, Cu mostly accumulated in the abaxial epidermis, suggesting a mechanism of compartmentalization to restrict mesophyll accumulation. The toxic effects of excess Cu were avoided to a certain extent by root immobilization, tissue compartmentalization, synthesis of complexing amino acids and induction of enzymes to prevent oxidative damage are among mechanisms adopted by Erica andevalensis to thrive in acidic-metalliferous soils.
Publisher version (URL)http://dx.doi.org/10.1007/s11104-009-0121-z
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