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International Journal on Algae
SJR: 0.229 SNIP: 0.261 CiteScore™: 0.24

ISSN Imprimer: 1521-9429
ISSN En ligne: 1940-4328

International Journal on Algae

DOI: 10.1615/InterJAlgae.v3.i4.80
pages 89-100

Transformation of urea during the growth of some blue-green (Cyanoprocaryota) and green (Chlorophyta, Chlorococcales) algae

V. A. Medved'
Institute of Hydrobiology National Academy of Sciences of Ukraine Kyiv, Ukraine
Ye. V. Borisova
N.G. Kholodny Institute of Botany, NAS of Ukraine, 2 Tereshchenkovskaya Str., Kiev 01004, Ukraine
Z. N. Gorbunova
Institute of Hydrobiology National Academy of Sciences of Ukraine Kiev, Ukraine

RÉSUMÉ

The accumulation of ammonium nitrogen in the culture medium of green and blue-green algae of the genera The accumulation of ammonium nitrogen in the culture medium of green and blue-green algae of the genera Acutodesmus (Hedew.) Tsar. (1 species), Chlorella Beijer, (1), Coelastrum Nag. (1), and Desmodesmus (Chod.) An, Friedl et Hegew. (5) was studied in the process of their growth on urea. It has been revealed that a sharp increase in the NH4+ concentration in the culture of blue-green algae due to the high activity of urease leads to their inhibition, and eventually to their death. Chlorococcal algae containing urea amidase differed in a low intensity of urea hydrolysis and in the absence of the inhibitory effect of NH4+ ions on their growth. In addition, it has been shown that the character of urea decomposition depends on the biological peculiarities of the species, which is the most distinct in representatives of the order Chlorococcales. The presence of accompanying (associated) bacteria in their culture leads to a decrease in the ammonium nitrogen quantity in the medium.


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