Evaluation of antioxidant enzymes activity under drought stress in different genotype of sugar beet (Beta vulgaris L.)

To evaluate the response of the antioxidant defense system of three sugar beet genotypes to drought stress, a two-year field experiment was conducted at the Research Site of the Sugar Beet Seed Institute of Karaj, Iran (۲۰۱۸-۲۰۱۹). The irrigation treatments were arranged in the main plots during growing seasons and included ۸۰ mm (control (I۱)), ۱۳۰ mm (I۲), and ۱۸۰ mm (I۳), evaporation from an A-class pan under surface irrigation method, ۳۰ mm (I۴), ۸۰ mm (I۵), ۱۳۰ mm (I۶), and ۱۸۰ mm (I۷: as severe drought); evaporation with ۱۰۰% volume of water requirement under trickle irrigation (tape) method; and ۳۰ mm (I۸) evaporation with ۷۵% volume of water requirement under trickle irrigation (tape) method. The second factor was genotype types included: ۷۱۱۲ (G۱), BP-Karaj (G۲), and BP-Mashhad (G۳) were in the subplots. The results showed that drought stress increased the activities of catalase (CAT), superoxide dismutase (SOD), and glutathione peroxidase (GPX) in sugar beet leaves. There were significant differences among genotypes for antioxidant enzyme activity. Also, irrigation × genotype interactions showed a significant difference in CAT and GPX activities. In addition, drought stress caused the production of reactive oxygen species (ROS), which results in greater membrane permeability, malondialdehyde (MDA) content, and oxidative stress in the plants. Moreover, genotypes having greater levels of antioxidants showed better resistance to drought stress.

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فعالیت کاتالاز ، گلوتاتیون پراکسیداز ، گونه های فعال اکسیژن ، عملکرد چغندرقند ، سوپراکسید دیسموتاز. ، فعالیت کاتالاز ، گلوتاتیون پراکسیداز ، گونه های فعال اکسیژن ، عملکرد چغندرقند ، سوپراکسید دیسموتاز.