Effects of ammonia and nitrogen limitation on glutamine synthetase activity in the blue alga microcystis firma

Genciova, A.

Biologia (Bratislava) 43(3): 251-258


ISSN/ISBN: 0006-3088
Accession: 005289904

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In one-step cultures of Microcystis firma nitrogen limitation was found to affect glutamin synthetase (GS) activity, the latter being related to NH4+ contents. In cultures with no NH4+ added, GS activity and ammonia concentration in the cells decreased with time of limitation. A positive correlation between NH4+ concentration and GS activity was observed only in cultures with no NH4Cl added. After addition of NH4+, GS activity and NH4+ concentration increased, but later a prolonged limitation led to a decrease in NH4+ concentration, GS activity remaining at the same level.