Effects of 24 Epibrassinolide on In Vitro Micropropagation of Highbush Blueberry

In order to elucidate effects of 24-epibrassinolide (EB) on the efficiency of in vitro regeneration of highbush blueberry (Vaccinium corymbosum L., cv. Brigitta blue), we analyzed variability of seven bioproductive parameters in regenerant plants cultured on nutrient media differing in hormonal composition. The additive action of EB, cytokinin (2iP), and auxin (IAA) was discovered for several parameters, such as reproduction coefficient, weight of regenerant plants, and the content of anthocyanin pigments. The greatest reproduction coefficients were noted in regenerant plants cultured on the medium containing 0.25 mg/L EB, 7.25 mg/L 2iP, and 1.00 mg/L IAA, as well as on the medium with 0.05 mg/L EB, 2.00 mg/L 2iP, and 0.50 mg/L IAA. It is suggested that low concentrations of 2iP and EB, applied in certain combinations, can be used for the industrial in vitro propagation of regenerant plants of highbush blueberry varieties

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

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

Features of seasonal accumulation of organic acids and carbohydrates in assimilating bodies of Rhododendron l. at the introduction under the conditions of Belarus

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