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Abstract
Cadmium (Cd) absorption and distribution in roots of water hyacinth plants [Eichhornia crassipes (Mart.) Solms] were studied. Absorption was faster at the first three hours and higher in the absence of calcium (Ca) in the nutrient solution. Cadmium adsorption to negative sites on the cell walls was evaluated by determining the exchangeable fraction in the presence of excess Ca. Both exchangeable and absorbed fractions were dependent on Cd concentration in the absorption media. The absorbed fraction increased with exposure time, whereas the exchangeable fraction remained constant. Cd was mainly associated with the subcellular fractions “soluble”; and “cell walls”;, with small amounts present in the fraction “organelles”;. Longer exposure time resulted in higher amounts of Cd in the first two fractions, specially the “soluble”; one, in which most of the Cd was associated with compounds of molecular weight higher than 4 kDa (84% after seven days), possibly phytochelatins.
Notes
Departamento de Biologia Vegetal, Universidade Federal de Viçosa, Brasil.
Departamento de Química, Universidade Federal de Viçosa, Brasil.
