Abstract
The time course of cadmium uptake by the roots of intact tomato plants (Lycopersicon esculentum Mill.) was measured in a nutrient solution with a micromolar cadmium concentration until all cadmium in the medium was exhausted. Exhaustion taking a few hours, cadmium was repeatedly added to the nutrient solution. The initial rate of cadmium uptake was computed for each cadmium addition. This rate sharply increased and ultimately leveled off, the maximum value being about three times higher than the value measured after the first cadmium addition. The stimulating effect of cadmium was associated with an inhibitory effect at higher levels of cadmium concentrations. An increase in the net cadmium influx with time could not be explained by the binding of heavy metal to a fixed number of organic compounds. Conceivably, the production of binding sites could be increased and cadmium might play a part in controlling the rate of sites production.
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Selected References
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- Cutler J. M., Rains D. W. Characterization of cadmium uptake by plant tissue. Plant Physiol. 1974 Jul;54(1):67–71. doi: 10.1104/pp.54.1.67. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Neyra C. A., Hageman R. H. Nitrate uptake and induction of nitrate reductase in excised corn roots. Plant Physiol. 1975 Nov;56(5):692–695. doi: 10.1104/pp.56.5.692. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Sabbioni E., Marafante E. Heavy metals in rat liver cadmium binding protein. Environ Physiol Biochem. 1975;5(3):132–141. [PubMed] [Google Scholar]
- Squibb K. S., Cousins R. J. Control of cadmium binding protein synthesis in rat liver. Environ Physiol Biochem. 1974;4(1):24–30. [PubMed] [Google Scholar]
- Vallee B. L., Ulmer D. D. Biochemical effects of mercury, cadmium, and lead. Annu Rev Biochem. 1972;41(10):91–128. doi: 10.1146/annurev.bi.41.070172.000515. [DOI] [PubMed] [Google Scholar]