ANALYSIS OF THE EFFECT OF POLYCHLORINATED BIPHENYLS ON THE ACTIVITY OF ANTIOXIDANT ENZYMES (SUPEROXIDE DISMUTASE, CATALASE, PEROXIDASE) OF ANNUAL SUNFLOWER (HELIÁNTHUS ÁNNUUS) IN A MODEL EXPERIMENT

Osinkina Tatyana Vladimirovna, Solovykh Galina Nikolaevna, Kolchugina Guzel Farykhovna, Kanunikova Elena Aleksandrovna, Tikhomirova Galina Mikhaylovna

The article presents the results of an experimental study of the effect of PCBs on the biochemical parameters of antioxidant protection of annual sunflower (Heliánthus ánnuus) in a model experiment. For the level of SOD and catalase, a sharp increase in activity was recorded at all stages of development under the influence of the minimum concentration of PCBs (0.0005 mg / l), for SOD by 2.7 times (seedlings), during the flowering period by 3 times. In the case of catalase, the activity at a PCB concentration of 0.0005 mg/l during the flowering period exceeded the control value by 14 times and by 3.95 times at a PCB concentration of 0.0012 mg/g. The activity of peroxidase in response to the primary impact of PCBs changed insignificantly. Thus, for the enzymes superoxide dismutase and catalase of annual sunflower (Heliánthus ánnuus), the phenomenon of a "paradoxical dose-effect relationship" was established when exposed to PCBs at a minimum concentration (0.0005 mg/l) at the MAC level.

Keywords:biochemical parameters, model experiment, polychlorinated biphenyls, annual sunflower, superoxide dismutase, catalase, peroxidase, enzyme isoforms.