Effect of Fluoride on Catalase, Guiacol Peroxidase and Ascorbate Oxidase Activities in Two Verities of Mulberry Leaves (Morus alba L.)

Abstact: A regulated balance between oxygen radical production and destruction is required of metaboli c efficiency and function is to be maintained either in normal or toxic conditions. A continually high anti oxidant capacities under toxicity conditions can present the damage correlated with resistance to that of particula r toxicity. Hence the mechanisms that reduce oxidative stress are expected to play an important role in imparting toxicity tolerance in plant. A significant alleviation in activities of peroxidase, catalase and ascorbic acid oxidase was recorded on both cultivars on exposure to fluoride. Further the degree of increase was found to b e dependent on severity and duration of exposure. Further degree of elevation in enzyme activity was relatively high in fluoride tolerant cultivar M when compared to sensitive cultivar V . Mulberry cultivar M on the whole, 5 1 5 exhibited more fluoride toxic tolerance than mulberry cultivar V . 1

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