Folia Microbiologica

, 37:223 | Cite as

Phosphorus deficiency, nitrogen assimilation and akinete differentiation in the cyanobacteriumAnabaena torulosa

  • T. A. Sarma
  • J. I. S. Khattar


Anabaena torulosa is unable to fix N2 and to differentiate akinetes in a P-deficient nitrate-free medium. In a P-deficient medium with nitrate, the NO3 assimilation and period of akinete differentiation are of the same order of magnitude as in a P-containing nitrate medium. It is suggested that regulation of akinete differentiation in P-deficient organism proceeds through the regulation of the N-assimilating system. At the time of akinete differentiation, cellular P is excreted into the medium which leads to a decrease of cellular P.


Acetylene Reduction Assay Brucine Phosphate Deficiency Akinete Formation Akinete Differentiation 


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Copyright information

© Institute of Microbiology, Academy of Sciences of the Czech Republic 1992

Authors and Affiliations

  • T. A. Sarma
    • 1
  • J. I. S. Khattar
    • 1
  1. 1.Department of BotanyPunjabi UniversityPatialaIndia

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