Abstract
Symbiotic Anabaena isolated from the water fern Azolla exhibits properties similar to those of heterocystous free-living cyanobacteria. Anabaena azollae is unique in its capacity of employing fructose for efficient N 2 fixation in the dark. Combined nitrogen compounds are metabolized by A. azollae and are tolerated at low concentrations. Both nitrate and NH + 4 affect the biosynthesis of nitrogenase and other proteins. The presence of low NH + 4 concentrations, which are tolerated by A. azollae , affects the cell structure and organization.
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