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Appl Environ Microbiol. 1986 August; 52(2): 340-344
Copyright © 1986, American Society for Microbiology. All Rights Reserved.

Nitrogen Limitation in Natural Populations of Cyanobacteria (Spirulina and Oscillatoria spp.) and Its Effect on Macromolecular Synthesis

Jaap VAN Rijn* and Moshe Shilo

The Division of Microbial and Molecular Ecology, Institute of Life Sciences, The Hebrew University of Jerusalem, Jerusalem, Israel

ABSTRACT

Natural populations of the cyanobacteria Spirulina species and Oscillatoria species obtained from Israeli fishponds were limited in growth by nitrogen availability in summer. Physiological indicators for nitrogen limitation, such as phycocyanin, chlorophyll a, and carbohydrate content, did not show clear evidence for nitrogen limited growth, since these organisms are capable of vertical migration from and to the nitrogen-rich bottom. By means of 14C labeling of the cells under simulated pond conditions followed by cell fractionation into macromolecular compounds, we found that carbohydrates synthesized at the lighted surface were partially utilized for dark protein synthesis at the bottom of these ponds.

FOOTNOTES

* Corresponding author.

Appl Environ Microbiol. 1986 August; 52(2): 340-344
Copyright © 1986, American Society for Microbiology. All Rights Reserved.



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Copyright © 1986 by the American Society for Microbiology. All rights reserved.