
Antioxidant capacity, photosynthetic characteristics and water relations of sunflower (Helianthus annuus L.) cultivars in response to drought stress
Keywords: روابط آب; ROS; reaction oxygen species; CAT; catalase; POD; peroxidase; PS-II; photosystem II; Fv/Fm; maximum photochemical efficiency of PS-II; PI; photosynthetic performance index; Chl-a; chlorophyll a; Chl-b; chlorophyll b; CAR; carotenoid; RWC; relative water c