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Cyanobacteria, as highly adaptable microorganisms, are characterized by an   ability to survive in different environmental conditions, in which a   significant role belongs to their enzymes. Phosphatases are enzymes produced   by algae in relatively large quantities in response to a low orthophosphate   concentration and their activity is significantly correlated with their   primary production. The activity of these enzymes was investigated in 11   cyanobacterial strains in order to determine enzyme synthesis depending on   taxonomic and ecological group of cyanobacteria. The study was conducted with   4 terrestrial cyanobacterial strains, which belong to Nostoc and Anabaena   genera, and 7 filamentous water cyanobacteria of Nostoc, Oscillatoria,   Phormidium and Microcystis genera. The obtained results showed that the   activity of acid and alkaline phosphatases strongly depended on   cyanobacterial strain and the environment from which the strain originated.   Higher activity of alkaline phosphatases, ranging from 3.64 to 85.14   μmolpNP/s/dm3, was recorded in terrestrial strains compared to the studied   water strains (1.11-5.96 μmolpNP/s/dm3). The activity of acid phosphatases   was higher in most tested water strains (1.67-6.28 μmolpNP/s/dm3) compared to   the activity of alkaline phosphatases (1.11-5.96 μmolpNP/s/dm3). Comparing   enzyme activity of nitrogen fixing and non-nitrogen fixing cyanobacteria, it   was found that most nitrogen fixing strains had a higher activity of alkaline   phosphatases. The data obtained in this work indicate that activity of   phosphatases is a strain specific property. The results further suggest that   synthesis and activity of phosphatases depended on eco-physiological   characteristics of the examined cyanobacterial strains. This can be of great   importance for the further study of enzymes and mechanisms of their activity   as a part of cyanobacterial survival strategy in environments with extreme   conditions. [Projekat Ministarstva nauke Republike Srbije, br. III 43002

Detection of phosphatase activity in aquatic and terrestrial cyanobacterial strains