Nitrogenase Activity and Nitrate Respiration in Azospirillum spp.

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dc.contributor.authorDavid B. Scott
dc.contributor.authorChristine A. Scott
dc.contributor.authorJohanna Dobereiner
dc.date.accessioned2014-09-08T04:38:47Z
dc.date.available2014-09-08T04:38:47Z
dc.date.issued1979
dc.description.abstractThe interaction between nitrate respiration and nitrogen fixation in Azoxpirillum lipoferum and A. hraxilenxe was studied. All strains examined were capable of nitrogen fixation (acetylene reduction) under conditions of severe oxygen limitation in the presence of nitrate. A lag phase of about 1 h was observed for both nitrate reduction and nitrogenase activity corresponding to the period of induction of the dissimilatory nitrate reductase. Nitrogenase activity ceased when nitrate was exhausted suggesting that the reduction of nitrate to nitrite, rather than denitrifi-cation (the further reduction of nitrite to gas) is coupled to nitrogen fixation. The addition of nitrate to nitrate reductase negative mutants (nr-) of Azoxpirillum did not stimulate nitrogenase activity. Under oxygen-limited conditions A. hrasilcnxe and A. lipoferum were also shown to reduce nitrate to ammonia, which accumulated in the medium. Both species, including strains of A. hraxilenxe which do not possess a dissimilatory nitrite reductase (nir~) were also capable of reducing nitrous oxide to N2.en_US
dc.identifier.citationArch.Microbiol. 121, 141-145, 1979en_US
dc.identifier.urihttp://hdl.handle.net/123456789/5442
dc.language.isoenen_US
dc.subjectAzospirillumen_US
dc.subjectDenitrificationen_US
dc.subjectNitrogen fixationen_US
dc.titleNitrogenase Activity and Nitrate Respiration in Azospirillum spp.en_US
dc.typeArticleen_US

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