Role of antioxidantes enzymes in reaction of Fraxinus excelsior L. on action of unfavourable conditions of environment

V. Bilchuk, T. Legostayeva, A. Rossihina-Galicha, Yu. Samborska

Oles Honchar National University of Dnipropetrovsk
72, Gagarin Ave., Dnipropetrovsk 49010, Ukraine

Features of functioning of the basic oxidoreductases (superoxiddismutase, peroxidase) and polyphenoloxidase (PPO) in vegetative organs of Fraxinus excelsior L in the conditions of polycomponental pollutants action in industrial city in process of ontogenesis are investigated. It is established, that at chronic action of pollutants there is an activation of investigated enzymes in leaves at different stages of a phenological cycle. Thus activity of superoxiddismutase (SOD) of experimental plants exceeded the control in 1,4–1,6 times, and peroxidase – in 1,6–3,0 times depending on a phase of development and duration of the stress-factor. Substantial growth of activity PPÎ (in 1,3–1,5 times) testifies to ability of the given kind to neutralise organic pollutants. Increase of activity of enzymes specifies in stability Fraxinus excelsior L. in the conditions of an industrial city. Presence of correlation communications between components of protective system of vegetative organs of plants in process of ontogenetical development is revealed.

Keywords: Fraxinus excelsior L., vegetative organs, aerotechnogenic contamination, oxidoreductases, superoxiddismutase, peroxidase, polyphenoloxidase

Full text (PDF)