International Journal on Algae

ISSN for PRINT: 1521-9429

For Online Access

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2002, Volume4

Issue 2

128 pages

Issue price - $216.00

Solomon P. Wasser
International Centre for Cryptogamic Plants and Fungi, Institute of Evolution, University of Haifa, Mt. Carmel, Haifa, Israel; and N.G. Kholodny Institute of Botany, National Academy of Sciences of Ukraine, Kiev, Ukraine

E. I. Shnyukova
N.G. Kholodny Institute of Botany, National Academy of Sciences of Ukraine, 2, Tereshchenkovskaya St., 01001 Kiev, Ukraine

E. K. Zolotareva
N.G. Kholodny Institute of Botany, National Academy of Sciences of Ukraine, 2, Tereshchenkovskaya St., 01010 Kiev, Ukraine

It has been shown that the influence of different sources of nitrogen incorporated into the composition of the nutrient medium on the production of exopolysaccharides from Nostoc linckia (Roth) Born. et Flah., st. 102 (Cyanophyta) is pronounced and depends on nitrogen form. The nitrate sources of nitrogen (NaNO₃, КNО₃) and mineral nitrogen limitation promote acceleration of the culture growth and increase the carbohydrate pool in cells of trichomes, polyglycanes of mucous sheaths and culture medium. Ammonium nitrogen (NH₄Cl, (NH₄)₂SO₄), irrespective of previous adaptation of algae to it, inhibits the growth processes and the accumulation of carbohydrates in cells of trichomes and mucous sheaths. The prolonged cultivation of N. linckia results in an abundant production of mucus with the polysaccharides that contain sulfate and carboxylic substituents. The accumulation of exopolysaccharides is an adaptive mechanism used by algae under conditions of moisture deficit.

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