Особенности сезонного накопления органических кислот и углеводов в ассимилирующих органах вечнозеленых и листопадных видов Rhododendron L. при интродукции в условиях Беларуси

Abstract

The data of comparative research of the maintenance of dry and pectinaceous substances, of some organic acids and soluble sugars in assimilating bodies of Rhododendron L. in the seasonal cycle of devel-opment under the conditions of Belarus are resulted in the article. Genotypic distinctions of parameters of accumulation of substances with the highest ability to biosynthesis are revealed. It is shown that at evergreen species of rhododendron in comparison with the wintered leaves the neogenic leaves were characterized by the smaller maintenance of solids and soluble sugars, but higher maintenance of free organic, ascorbic and carbolic acids, and also pectinaceous substances, especially protopectin. Thus neogenic leaves of deciduous species of rhododendron in comparison with evergreen species have appeared much more poorly by titratable acids and protopectin, but richer by soluble sugars, carbolic acids and especially by vitamin C and hydropectin at the similar maintenance in them of solids. Throughout the vegetative period it was observed the essential pauperization of assimilating bodies of evergreen species of rhodo-dendron by soluble sugars, free organic, ascorbic and carbolic acids against considerable enrichment by dry and pectinaceous substances.