| Pak. J. Bot., 36(1):133-143, 2004. | Back to Contents | ||||
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Updated: 09-07-09 | ||||
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CHARACTERIZATION OF FIVE MARINE CYANOBACTERIAL SPECIES WITH RESPECT TO THEIR pH AND SALINITY REQUIREMENTS AZRA BANO AND PIRZADA J. A. SIDDIQUI* Abstract: Cyanobacteria a rich source for many useful natural products are used as feed and fertilizer. Optimum condition for their mass culture was evaluated. Here we characterize five marine cyanobacterial species isolated from different niches at Buleji, a rocky shore near Karachi and describe their pH and salinity requirements. Growth rates were determined at three pH values (6.5, 7.4 & 8.0) and four salinity values (5, 10, 20 & 40‰). According to both chlorophyll and protein estimations all cyanobacterial species appear to have preferred near neutral to alkaline pH. Although all cyanobactrial species were able to grow at all salinities, the best growth was observed at a particular salinity. Four out of five isolates of cyanobacteria were able to grow under nitrogen-limited conditions and therefore, may be considered as putative nitrogen fixing species. Centre of Excellence in Marine Biology, University of Karachi, Karachi 75270 Pakistan |
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