CHANGES OF SOME ANTIOXIDANT ENZYME ACTIVITIES IN LEAVES OF DROUGHT TOLERANT VARIETIES OF WHEAT FROM OLTENIA DURING VEGETATION STAGES

In Oltenia drought is becoming a major environmental constraint on crop production and one of the solicited characteristics in the present in these area is drought tolerance. With that end in view, this study aims to thoroughly experiment of investigated varieties in comparative crops in the specific pedological, climatic and technological conditions of Oltenia in order to point out the most stable and high performance genotypes. One of the earliest responses of plants to drought is the accumulation of active oxygen species such as superoxide, hydroxyl radicals, hydrogen peroxide and singlet oxygenes. Plants protect cell systems from the cytotoxic effects of these active radicals using enzymes such as superoxide dismutase, ascorbat peroxidase, glutathione reductase, catalase and non-enzymatic antioxidants: glutathione, ascorbic acid and carotenoids. The current paper presents the changes of anti-oxidative indices in leaves of five varieties of wheat during development time. We observed significant differences between behaviors from different genotypes.