Effect of cations, including heavy metals, on cadmium uptake by Lemna polyrhiza L
| Autor: | N. Noraho, J. P. Gaur |
|---|---|
| Rok vydání: | 1995 |
| Předmět: |
inorganic chemicals
Cadmium Lemna biology Magnesium Potassium Sodium Inorganic chemistry Metals and Alloys chemistry.chemical_element Zinc Calcium biology.organism_classification General Biochemistry Genetics and Molecular Biology Biomaterials chemistry General Agricultural and Biological Sciences Intracellular |
| Zdroj: | Biometals. 8 |
| ISSN: | 1572-8773 0966-0844 |
| DOI: | 10.1007/bf00142006 |
| Popis: | Cations, including calcium, magnesium, potassium, sodium, copper, iron, nickel and zinc, inhibited (up to 40%) extracellular binding and intracellular uptake of cadmium by Lemna polyrhiza in solution culture. Test plants showed a high capacity of extracellular cadmium binding which was competitively inhibited by copper, nickel and zinc; however, calcium, magnesium and potassium caused non-competitive inhibition. Iron and sodium increased K m and decreased V max, thereby causing mixed inhibition of extracellular binding. Intracellular cadmium uptake displayed Michaelis-Menten kinetics. It was competitively inhibited by calcium, magnesium, iron, nickel and zinc. Monovalent cations (sodium and potassium) caused non-competitive and copper caused mixed inhibition of intracellular cadmium uptake. Thus, high levels of cations and metals in the external environment should be expected to lower the cadmium accumulation efficiency of L. polyrhiza. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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