RT Journal Article SR Electronic(1) A1 Rai, Amar N. A1 Rowell, Peter A1 Stewart, William D. P.YR 1981 T1 Glutamate Synthase Activity in Symbiotic Cyanobacteria JF Microbiology, VO 126 IS 2 SP 515 OP 518 DO https://doi.org/10.1099/00221287-126-2-515 PB Microbiology Society, SN 1465-2080, AB Glutamate synthase (GOGAT) activities of the symbiotic cyanobacteria of the lichens Peltigera canina and Peltigera aphthosa and of the water fern Azolla caroliniana have been determined and, like glutamine synthetase (GS) activity, found to be substantially reduced compared with the activities found in the free-living cyanobacteria. A similar reduction in GOGAT activity was not noted in the symbiotic green alga (Coccomyxa sp.) in P. aphthosa. The selective reduction of GS-GOGAT activity in symbiosis may be related to the production of extracellular nitrogen by the symbiotic cyanobacterium., UL https://www.microbiologyresearch.org/content/journal/micro/10.1099/00221287-126-2-515