EFFECTS OF UV-B STRESS ON C3 and C4 PLANTS’ ANTIOXIDANT RESPONSE PARAMETERS
Project no. 500 · Status: Kapanmış · 2018
Summary
UV-B radiation is the portion of the electromagnetic spectrum between 280 to 320 nm. A portion of UV-B radiation reaches the Earth’s surface without being filtered by the atmosphere, thus making it the most harmful radiation reaching Earth’s surface. Moreover, amount of UV-B reaching the Earth’s surface has increased in 20th century due to depletion of ozone layer. C4 plants have adapted to harsh environmental conditions and in order to avoid excess photorespiration, they fix CO2 in mesophyll cells and release it to bundle sheath cells. There are no studies on comparative ROS formation and antioxidant enzymes in C3 and C4 species of the same genus. With this aim, antioxidant defense system (superoxide dismutase (SOD), peroxidase (POX), catalase (CAT), glutathione reductase (GR), ascorbate peroxidase (APX), dehydroascorbate reductase (DHAR) enzymes and their isoenzymes, and lipid peroxidation in seedlings of Cleome spinosa (C3) and Cleome gynandra (C4) species of Cleome genus exposed to UV-B stress were comparatively investigated. C. spinosa was better able to cope with UV-B stress.