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Registro Completo |
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Biblioteca(s): |
Embrapa Solos. |
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Data corrente: |
08/10/2021 |
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Data da última atualização: |
08/10/2021 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
SCOTT, D. B.; SCOTT, C. A.; DOBEREINER, J. |
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Afiliação: |
DAVID B. SCOTT, UNIVERSITY OF CALIFORNIA; CHRISTIANE A. SCOTT, UNIVERSITY OF CALIFORNIA; JOHANNA DOBEREINER, SNLCS. |
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Título: |
Nitrogenase activity and nitrate respiration in Azospirillum spp. |
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Ano de publicação: |
1979 |
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Fonte/Imprenta: |
Archives of Microbiology, v. 121, n. 2, p. 141-145, 1979. |
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DOI: |
https://doi.org/10.1007/BF00689978 |
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Idioma: |
Inglês |
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Conteúdo: |
The interaction between nitrate respiration and nitrogen fixation inAzospirillum lipoferum andA. brasilense 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 denitrification (the further reduction of nitrite to gas) is coupled to nitrogen fixation. The addition of nitrate to nitrate reductase negative mutants (nr-) ofAzospirillum did not stimulate nitrogenase activity. Under oxygen-limited conditionsA. brasilense andA. lipoferum were also shown to reduce nitrate to ammonia, which accumulated in the medium. Both species, including strains ofA. brasilense which do not possess a dissimilatory nitrite reductase (nir-) were also capable of reducing nitrous oxide to N2. |
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Thesagro: |
Fisiologia; Microrganismo. |
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Thesaurus Nal: |
Azospirillum. |
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Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
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Marc: |
LEADER 01646naa a2200193 a 4500
001 2135195
005 2021-10-08
008 1979 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1007/BF00689978$2DOI
100 1 $aSCOTT, D. B.
245 $aNitrogenase activity and nitrate respiration in Azospirillum spp.$h[electronic resource]
260 $c1979
520 $aThe interaction between nitrate respiration and nitrogen fixation inAzospirillum lipoferum andA. brasilense 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 denitrification (the further reduction of nitrite to gas) is coupled to nitrogen fixation. The addition of nitrate to nitrate reductase negative mutants (nr-) ofAzospirillum did not stimulate nitrogenase activity. Under oxygen-limited conditionsA. brasilense andA. lipoferum were also shown to reduce nitrate to ammonia, which accumulated in the medium. Both species, including strains ofA. brasilense which do not possess a dissimilatory nitrite reductase (nir-) were also capable of reducing nitrous oxide to N2.
650 $aAzospirillum
650 $aFisiologia
650 $aMicrorganismo
700 1 $aSCOTT, C. A.
700 1 $aDOBEREINER, J.
773 $tArchives of Microbiology$gv. 121, n. 2, p. 141-145, 1979.
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Embrapa Solos (CNPS) |
