LIPID COMPOSITION OF TETRASELMIS SUECICA AND PHAEODACTYLUM TRICORNUTUM UNDER THE INFLUENCE OF INDOLYL-3-BUTYRIC ACID

Currently, microalgae are considered one of the most promising sources of raw materials for various industries. Hormones of exogenous origin make it possible to control the growth and biochemical parameters of microalgae. The purpose of this study was to determine the effect of optimal concentrations of indolyl-3-butyric acid (IBA) on the growth parameters and dynamics of the lipid composition of Tetraselmis suecica (Kylin) Butcher, 1959 and Phaeodactylum tricornutum Bohlin, 1897 cultures. The study established growth-promoting concentrations of IBA for T. suecica at 0.4 × 10–5 mol · L-1 and for Ph. tricornutum at 0.6 × 10–5 mol · L-1. A decrease in the content of polyunsaturated fatty acids (PUFA) is indicated for Ph. tricornutum. The stimulating effect of phytohormone on the accumulation of chlorophyll and lipids of T. suecica was revealed. The content of monogalactosyldiacylglycerol (MGDG) decreased, but digalactosyldiacylglycerol (DGDG), sulfoquinovosyldiacylglycerol (SQDG) increased. The prospects of regulating the production characteristics of microalgae under the influence of IMC in an enrichment culture is discussed.