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Babeanu C.,University of Craiova | Constantin C.,National Researches and Development Institute for Soil Science | Paunescu G.,Research and Agricultural Development Station from Simnic | Popa D.,University of Craiova
Journal of Environmental Protection and Ecology | Year: 2010

The objective of the present study was to investigate the effect of water stress (50% field capacity) on catalase activity, superoxide dismutase activity, peroxidase system and photosynthetic pigments content of 5 varieties of wheat. These were chosen because they had a high productivity level in drought conditions. Drought is one of the ecological factors limiting crop production. One of the earliest responses of plants to drought is the accumulation of active oxygene species such as superoxide, hydroxyl radicals, hydrogene peroxide and singlet oxygen. 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. Although the study has been made during the plants growth and development process, in this paper only the results obtained from the steam elongation stage are presented. The results showed clear difference in the participation of antioxidant enzymes in the drought tolerance of wheat. Each wheat genotype had discrete water stress threshold and, therefore, they had different physiological adaptive mechanism to regulate their redox status. All studied genotypes show a 50% hydric deficiency soil tolerance.

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