ASSESSMENT OF PEROXIDASE ACTIVITY IN LEAVES OF PLUM AND APPLE TREES DURING THE VEGETATION PERIOD, DEPENDING ON THE GENOTYPE AND GROWING CONDITIONS

The activity of the peroxidase enzyme in the leaves of late plum and apple tree varieties growing under controlled watering and simulated drought conditions was studied. The peroxidase system serves as a unique indicator of the stress state of plants and provides sufficient information on their physiological state and is a criterion for their resistance to abiotic factors. It was shown that in the leaves of trees grown under water deficit conditions, a higher increase in peroxidase activity was observed compared to the control. The highest level of enzyme activity was found in the leaves of the studied apple varieties. Studies conducted on plum and apple trees showed that the activity of the peroxidase enzyme in the leaves depended on various factors: environmental conditions, the intensity of metabolic processes occurring in certain phenophases of growth and development of trees, as well as on the biological characteristics of the varieties. Keywords: plum, apple, drought, temperature, antioxidant enzyme, peroxidase. DOI: https://doi.org/10.59295/sum1(181)2025_38