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To understand the adaptability of alfalfa (Medicago sativa L.) to environmental stress, the activity of antioxidant enzyme catalase in alfalfa shoots were analyzed at three slopes, subjected to drought stress during vegetation. The presence of the enzyme catalase is a signal that changes occur in plants, due to certain environmental abiotic stress factors. Catalase is a ferment that intensely catalyzes the decomposition of hydrogen peroxide into water and oxygen, which is produced under stressful conditions. Owing to the toxic nature of H2O2 to living plant cell, the importance of catalase is of great essence for the plants to adapt to stressful environmental conditions. Therefore, increased antioxidant activity of the enzyme catalase is considered as an indicator of abiotic stress conditions in plants. In this paper, the activity of catalase enzyme at alfalfa (Medicago sativa L.) was investigated, depending on the climatic conditions in three regions of Tetovo, Skopje and Ovche Pole, in 19 different locations in the Republic of North Macedonia. The results showed that in the Ovche Pole region, where the arid period is the longest, the activity of the catalase enzyme is highest in all three slopes. The enzyme catalase is an indicator of abiotic stress in the Ovche Pole region. Key words: antioxidant activity, Walter climate diagram, water deficit, hydrogen peroxide. |
