Abstract
Aquaspirillum magnetotacticum strain MS-1 and two nonmagnetic mutants derived from it reduced C2H2 microaerobically but not anaerobically even with NO3 −. This organism apparently is not capable of NO3 −-dependent nitrogen fixation. Cells ofA. magnetotacticum reduced C2H2 at rates comparable to those ofAzospirillum lipoferum grown under similar conditions, but much lower than that ofAzotobacter vinelandii grown aerobically. Cells ofA. magnetotacticum in anaerobic cultures lacking NO3 − did not reduce C2H2 until O2 was introduced. Optimum rates of C2H2 reduction byA. magnetotacticum were obtained at 200 Pa O2. C2H2 reduction was inhibited by more than 1 kPa O2 or 0.2 mM NO3 − or NH4 +. These results suggest thatA. magnetotacticum fixes N2 only under microaerobic, N-limited conditions.
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Bazylinski, D.A., Blakemore, R.P. Nitrogen fixation (acetylene reduction) inAquaspirillum magnetotacticum . Current Microbiology 9, 305–308 (1983). https://doi.org/10.1007/BF01588824
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DOI: https://doi.org/10.1007/BF01588824