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Effect of cations, including heavy metals, on cadmium uptake byLemna polyrhizaL.

✍ Scribed by N. Noraho; J. P. Gaur

Publisher
Springer Netherlands
Year
1995
Tongue
English
Weight
337 KB
Volume
8
Category
Article
ISSN
1572-8773

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✦ Synopsis

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 Vmax, 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.

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The effect of heavy metal ions (Cu\*+, Ni\*+) on the electrokinetic properties of S. cerevisiae was investigated by microekctrophoresis. The uptake of metal ions is associated with a change in surface charge on the cell surface. Increasing pH results in the cell surface being more negatively charged