Published Paper Details:

The ATPase activity showed normal behavior in the control set, where as , in cadmium chloride exposure, the alga showed dual behavior. The ATPase enzyme activity showed a maximum of 6.7% increase at concentration-X of cadmium chloride on 15th day of exposure and when the exposed alga was transferred to toxicant free medium 12.3% increase was noted on 15th day of recovery. At concentration-Y, a maximum of 6.4% decrease in enzyme activity was marked on 15th day of exposure and when the exposed alga was transferred to toxicant free medium 18.7% decrease was noted on 15th day of recovery. At concentration-Z, a maximum of 91.8% decrease in enzyme activity was marked on 15th day of exposure and when the exposed alga was transferred to toxicant free medium 99.02% decrease in the enzyme activity was noted on 15th day of recovery. At concentration-X, little increment was noted at all exposure and recovery periods. However, these increments were well within the standard deviation range, when compared to control set. Hence, it was not possible to say that the increment caused in the parameter was due to the toxicant, Cadmium chloride. Basing on this type of insignificant increase, it was also not possible to indicate that the toxicant showed dual behavior in its action. No recovery was noted in all the two higher (Y and Z) concentrations of cadmium chloride selected. At sub-lethal concentration of the toxicant, cadmium chloride stimulation of the enzyme activity and at higher concentrations of cadmium chloride inhibition of ATPase activity was observed. This dual behavior of the toxicant can be exploited for phytoremediation studies.