Komaristaya V. P.

V.N. Karazin Kharkiv National University

Some species of extremophilic algae are cultivated industrially, e.g., Dunaliella salina Teodoresco, to manufacture mixed carotenoids (mainly beta-carotene) and Haematococcus pluvialis Flotow, to manufacture astaxanthin for food and feed. In their cells, secondary carotenoids accumulate outside the thylakoid membranes in oil bodies inside the chloroplast stroma or the cytosol and do not participate in photosynthetic light-harvesting. It is known, that carotenoid and triacylglycerol deposition correlates in these algae. In D. salina, inhibition of triacylglycerol biosynthesis (by sethoxydim or cerulenin) caused the suppression of beta-carotene overproduction under sulfate starvation and high light [4]. Algal lipids are of use as bioactive ingredients containing valuable polyunsaturated fatty acids and as biodiesel sources. Studying culture condition effects onto carotenoid and lipid content in algae is of practical importance and theoretical one as well. It is necessary for finding the mechanistic explanation for the co-regulation of carotenoid and triacylglycerides accumulation in algal cells.