Changes in activity of oxidative enzymes was shown when infecting the callus culture of sugar beet cells by phytopathogenic mollicute Acholeplasma laidlawii var granulum 118. Maximum indices of the enzyme activity were fixed 3 hours after infecting with regard to control: it was 49% for peroxidase, 38% for catalase and 45% for polyfenoloxidase. The decrease of enzymatic activity to 22%, 12% and 19%, respectively, was registered 5 hours after infecting, and after that all these indices became stabilized. Changes in the activity of components of antioxidative protection were probably connected with induction of plants' protective mechanisms in response to penetration of pathogenic mollicutes.
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