Torun, HülyaAydın, Harun2023-07-262023-07-2620212148-7855https://search.trdizin.gov.tr/yayin/detay/534843https://hdl.handle.net/20.500.12684/13304Seseli resinosum Freyn & Sint. is an endemic perennial plant of rocky habitat of the Western Black Sea region of Turkey. To understand drought responses and tolerance mechanism of Seseli resinosum Freyn & Sint., relative water content (RWC), chlorophyll fluorescence, proline accumulation, lipid peroxidation (TBARS), hydrogen peroxide (H2O2) content and changes in antioxidant enzymes were assayed in polyethylene glycol (PEG) 6000 (5, 10 and 15%) induced drought stress in the present study. Leaf RWC maintained unchanged, while chlorophyll fluorescence reduced with a high PEG level (15%). Additionally, H2O2 and proline accumulation were determined with the increase of PEG application, but no increase in TBARS was determined. Moreover, the increment in H2O2 content under drought was accompanied by an increase glutathione reductase, catalase and superoxide dismutase activities. On the other hand, PEG-induced drought stress caused a reduction in peroxidase and ascorbate peroxidase activities. These results suggest that endemic Seseli resinosum Freyn & Sint. plant has an efficient drought tolerance, as displayed by enhanced antioxidant enzyme activities maintaining water status under drought conditions. In this study, important information about physiological and antioxidative responses of endemic Seseli resinosum Freyn & Sint. was revealed for the first time.eninfo:eu-repo/semantics/openAccessArticle171199213534843