N2 Fixation by Non-Heterocystous Cyanobacteria

Nitrogen fixation by Oscillatoria spp. under autotrophic and photoheterotrophic conditions

“…Such a correlation has also been reported for Synechococcus spp. (Mitsui etal., 1987;Grobbelaar et al, 1987) but was not observed in Gloeothece Gallon, 1989). Both species of Oscillatoria appeared more pigmented under photoheterotrophic conditions than did photoautotrophically grown cultures.…”

Diversity, Ecology, and Taxonomy of the Cyanobacteria

“…Nitrogen fixation has been reported in a number ofaxenic unicellular cyanobacteria [reviewed by Gallon and Chaplin (1988) and Gallon (1990)]. These strains have been isolated from a variety of habitats, including rocks, rice fields, and the marine intertidal zone, but apparently not the open ocean.…”

Evidence of nitrogen fixation by non-heterocystous cyanobacteria in the Baltic Sea and re-calculation of a budget of nitrogen fixation

“…León et al 1986, Gallon & Chaplin 1988. The early acetylenereduction technique required enrichment of the samples by net plankton in order to concentrate enough biomass for the measurement.…”

“…Reddy et al 1993), while heterocystous cyanobacteria are able to perform nitrogen fixation during day in their heterocysts (review: Bergman et al 1997). Gallon & Chaplin (1988) unequivocally demonstrated nitrogenase activity in axenic clones of Gloeocapsa alpicata, with nitrogenase activity being temporally separated from oxygenic photosynthesis. Similarly, León et al (1986) have shown a cyclic inverse relationship between nitrogen fixation and photosynthesis in some marine Synechococcus species.…”