Kinetics and mechanism of tolerance induction on acclimation of Villorita cyprinoides (Hanley) to copper and zinc.
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Date
1996-12
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Abstract
The typical euryhaline clam Villorita cyprinoides (Hanley) was acclimated to copper
and zinc at salinity 13 × 10-3 and < 1× 10-3 (fresh water). Acclimation enhanced the lethal
tolerance, as denoted by dose-survival curves, which was more pronounced after zinc acclimation.
In fresh water copper acclimation sensitized the organisms. The copper accumulation trend was
significantly changed consequent to metal acclimation, especially after zinc acclimation, indicating
some tissue metal regulatory effect. Acclimation to copper equiped the organism to survive
for longer periods with increased body burden of copper, while zinc acclimation supressed the
uptake of the more toxic ion copper. The earlier report of increased uptake of zinc by this
organism during combined exposure with copper is corelated in the present context. The role of
metallothionein like protein in providing protection against metal toxicity, the environmental
implication of acclimation phenomena are indicated.
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Keywords
Acclimation, Villorita cyprinoides, tolerance, metallothionein
Citation
Sathyanathan B. Kinetics and mechanism of tolerance induction on acclimation of Villorita cyprinoides (Hanley) to copper and zinc. Journal of Biosciences. 1996 Dec; 21(6): 809-818.