Summary
Rice plants are grown in nutrient solutions (Hoagland-Arnon 1) containing different concentrations of cadmium (0.005; 0.010 and 0.100 ppm) and one concentration of zinc (0.070 ppm) traced respectively with109Cd and65Zn. Distribution and localization of both elements are studied at plant and cellular levels. Contrary to zinc, cadmium remains fixed by radicular sites and its translocation index is very low. Centrifugation of roots homogenates showed that % Cd recovered in the residue increases with Cd concentration and emphasize the high capacity of Cd fixation by walls when Cd external concentration is high. The relative distributions of Cd and Zn present at the same concentration in the growing medium are quite identical. In the 100,000×g supernatant fraction of roots, both elements are associated with compounds of low molecular weight, Cd being bound to higher MW ligands than zinc (1000 to 3000 for zinc). The fact that Cd was recovered in fractions in which most of35S-cysteine was present suggests that in plants, like in animals, peptides rich in — SH residues may play a role in the fixation of heavy metals.
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Contribution no. B 101488 of the Biology-Radiation Protection and Medical Research Programme DG XII CEC.
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Dabin, P., Marafante, E., Mousny, J.M. et al. Absorption, distribution and binding of cadmium and zinc in irrigated rice plants. Plant Soil 50, 329–341 (1978). https://doi.org/10.1007/BF02107182
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DOI: https://doi.org/10.1007/BF02107182