Antioxidant Defense System and Physiological Insights to Drought Stress in Urtica dioica L.
2023
Torun, Hulya
Urtica dioica L. (stinging nettle), is an herbaceous and dioecious perennial flowering plant, has been used as herbal medicine since ancient times. The aim of the present study was to investigate drought responses and tolerance mechanism of U. dioica. For this purpose, growth, water status, osmotic potential, chlorophyll fluorescence, lipid peroxidation (TBARS), hydrogen peroxide (H2O2) content and antioxidant enzyme activities were determined under drought stress. Relative growth rate, water content, osmotic potential and chlorophyll fluorescence were significantly reduced with drought treatment. Additionally, drought lead to increase in TBARS and H2O2 level. Moreover, the increment in H2O2 content under drought was accompanied by increased in superoxide dismutase (SOD), catalase (CAT) and glutathione reductase (GR) activities. On the other hand, drought stress caused a reduction in ascorbate peroxidase (APX) activity, while there was no significant change in peroxidase (POX) activity. These results suggest that U. dioica has an efficient drought tolerance, as displayed by enhanced antioxidant enzyme activities. In this study, antioxidant defence and ROS detoxification capacity have been elucidated in U. dioica under drought stress.
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