SUMMARY: A comparative study was made of enzymes involved in nitrogen and carbon metabolism in the cyanobiont directly isolated from coralloid roots, and in the cultured isolate 7422. The symbiotic showed high activity of glutamine synthetase and glutamate synthase, the primary ammonia-assimilating enzyme system in cyanobacteria. Ammoniaassimilating glutamate dehydrogenase (GDH) activity was undetectable, although the catabolic GDH activity was high. Both glutamate-oxaloacetic acid transaminase and malate dehydrogenase showed higher activities in the symbiotic than in the cultured strain. The symbiotic did not fix CO although in cell-free extracts both ribulose-1,5-bisphosphate carboxylase and phosphoribulokinase activities, similar to those in the cultured strain, were present.


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