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EFFECT OF MERCURY AND CADIMIUM ON THE ENZYME ACTIVITY OF HYDRILLA PLANT

The study of toxicity of metals on the enzyme activity in the Hydrilla plant indicated that in general there is induction or inhibition in enzyme activity. The enzymes studied here in relation Hg and Cd toxicity like catalase, peroxidase and polyphenol oxidase found in the plant responded differently to the metal treatment. Catalase and polyphenol oxidase showed a decrease in the activity whereas peroxidase enzymes were stimulated by the metals. When the metals were treated along with growth hormone Kinetin, there was substantial recovery of the enzyme activity in the test plant. Other enzymes like acid phosphatase, acid/alkaline protease, acid /alkaline prophophatase and RNase were also studied to correlate the decrease in the molecular content in the test plant responded a decline in its activity with the metal treatment. However, the addition of Kinetin to the metals (HgCl2 and CdSo4) showed a recovery in the enzyme activity in the hydrilla plant .All these observations indicates that the aquatic plant hydrilla can be used as an indicator plant to assess the metal toxicity in the aquatic system.