AN INVESTIGATION OF THE BIOCHEMICAL COMPOSITION OF NORWAY MAPLE (ACER PLATANOIDES L.) IN THE CONDITIONS OF TECHNOGENIC STRESS

Abstract

A reasonably large number of publications devoted to the study of the role of antioxidant substances in plants growing under anthropogenic stress have appeared in scientific journals. However, these problems and issues are not studied sufficiently. This study aimed to reveal the biochemical composition features of Norway maple (Acer platanoides L.) in the conditions of urban plantations (by the example of the large industrial center in the city of Naberezhnye Chelny). The paper presents the results of investigations of biochemical composition features of Norway maple in the conditions of a large industrial center, the city of Naberezhnye Chelny (the Republic of Tatarstan). In the circumstances of intensive technogenic load, Norway maple shows higher ascorbic acid oxidase activity at the initial stages of active vegetation and lower activity at the end of vegetation, in comparison with plants in the conventional control zones (CCZ). At the same time, the content of ascorbic acid in the leaves also decreases during the vegetation of plants in the buffer zone plantations of industrial enterprises and trunk plantations. In the buffer zone plantations of industrial enterprises and trunk plantations, Norway maple was characterized by an increase in polyphenol oxidase activity, in comparison with the control plantings. The rise in polyphenol oxidase activity is accompanied by a decrease in the content of tannins. Norway maple in trunk plantations has lower peroxidase activity in its leaves in the conditions of the most intense load in July than in plantations of CCZ, and in August, this activity is higher than in the control group.