Response of Nostoc calcicola and Anabaena sp. and their mutants to elevated levels of inorganic carbon

Jaiswal, P. and Prasanna, R. and Kashyap, A. K. and Singh, P. K. (2004) Response of Nostoc calcicola and Anabaena sp. and their mutants to elevated levels of inorganic carbon. Acta Botanica Hungarica, 46 (1-2). pp. 167-178. ISSN 0236-6495

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Abstract

The influence of inorganic carbon compounds (sodium bicarbonate and carbon dioxide) on cell volume of nitrogen fixing cyanobacteria - Nostoc calcicola and its mutant resistant to high concentrations of bicarbonate (HCO3-R), and Anabaena sp. and its mutant resistant to high concentrations of carbon dioxide (CO2R) was investigated. Morphologically, HCO3-R and CO2R mutants (isolated through mutagenesis with MNNG) exhibited shorter trichomes consisting of 4-20 cells per trichome. Following incorporation of HCO3- or CO2 in the growth medium, the cell volume increased in the wild type strains and their mutants in a concentration dependent manner. It was concluded that the significant effect on cell volumes of wild type and mutants, may be due to intracellular influx of bicarbonate ions or CO2 molecules.

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