ALLELOPATHIC ACTIVITY OF THE VEGETATIONAL MASS SECRETIONS OF MOLDAVIAN DRAGONHEAD SPECIES (DRACOCEPHALUM MOLDAVICUM L.)

Abstract

The article is dedicated to the study of the dynamics of allelopathic activity of secretions (water-soluble, alcohol-soluble and volatile) from vegetative and generative organs of the plants of Dracocephalum moldavicum L. species. Allelopathic effect of water-soluble and alcohol-soluble extracts had exclusively phytotoxic activity on selected test objects regardless of growing conditions and plant organs, except for the extracts from Moldavian dragonhead leaves under environmental conditions of Uman city at the beginning of the growing season and in the budding phase. An interesting result was also noted concerning the volatile secretions of Moldavian dragonhead, which were the most active toward the acceptor. Roots of garden cress among the test objects were sensitive to the inhibitory effect of water-soluble secretions. Extracts of leaves and inflorescences showed sufficiently high phytotoxicity.