Effects of UV radiation on antioxidant enzymes activity at 4-6 pair leaf stage of Dracocephalum moldavica

Over the past few decades, the growing ozone depletion could lead to an increase in solar UV radiation reaching the Earth‟s surface. Ultraviolet radiation negatively affects plant cells, causing reactive oxygen species (ROS) to be generated. The purpose of this study was to investigate the effects of ultraviolet radiation (under 320nm) on antioxidant activities of Dracocephalum moldavica as herbal medicine. In this study, plants in (4-6) pair leaf stage were exposed to different doses of ultraviolet radiation (7, 15, 22, 30, 37, 51 kjm-2d-1) for 12 days. After treatment antioxidant enzymes activity (catalase, peroxidase, and superoxide dismutase and ascorbate peroxidase) evaluated. Data were analyzed using SPSS software and ANOVA test. The results showed that by increasing the ultraviolet radiation, catalase and peroxidase showed a similar trend in the significant increase in doses of 15 and 30 kjm-2d-1 and a significant reduction in higher doses of UV. The activity of superoxide dismutase had reverse trend compared with above mentioned enzymes. However, the amount of ascorbate peroxidase enzyme was decreased in all doses compared to the control

کلیدواژه ها:

Dracocephalum moldavica ، ROS ، Catalase ، Peroxidase ، Superoxide dismutase