Inhibition of methanogens increases photo-dependent nitrogenase activities in anoxic paddy soil amended with rice straw

FEMS Microbiology Ecology
N HaradaS Matsumoto

Abstract

The interaction between phototrophic dinitrogen fixers and methanogens was examined in soil slurries amended with rice straw using 2-bromoethanesulfonic acid (BES), a specific methanogenic inhibitor. Slurries incubated in light increased phototrophic nitrogenase activity (acetylene reducing activity), and showed growth of phototrophic purple bacteria and reduction of CH(4) emission, indicating outcompetition of purple bacteria with methanogens in photic zones. Adding BES effectively inhibited methane production and markedly increased phototrophic acetylene reducing activity accompanied with acetate accumulation, but did not affect populations of purple bacteria in the slurries. More acetate accumulated in the inhibited slurries incubated in dark. We suggest that increased availability of organic substrates for purple bacteria after stopping methanogenic consumption by BES caused the increased phototrophic acetylene reducing activity. These results indicate that, after purple bacteria grow enough, performance of their N(2) fixation may be limited by substrate availability, which methanogenesis may profoundly influence.

References

Oct 1, 1978·Journal of Bacteriology·J MeyerP M Vignais
Sep 1, 1992·Journal of Bacteriology·J G Ferry
Jan 21, 2000·FEMS Microbiology Ecology·K Glissmann, R Conrad
Sep 1, 1996·Environmental Monitoring and Assessment·R WassmannH Rennenberg

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Citations

Apr 15, 2006·Biotechnology Letters·Wook ChangTracey R Pulliam Holoman
May 3, 2005·The Journal of General and Applied Microbiology·Chika TadaShigeki Sawayama
Feb 13, 2020·Environmental Science and Pollution Research International·Passagorn HosakulSumate Chaiprapat
Jul 1, 2009·Proceedings of the National Academy of Sciences of the United States of America·Tanja BosakAlexander P Petroff

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