Data/hora: 19/06/2024 14:26:43

Biblioteca(s): | Embrapa Solos.
Data corrente: | 08/10/2021
Data da última atualização: | 08/10/2021
Autoria: | SCOTT, D. B.; SCOTT, C. A.; DOBEREINER, J.
Afiliação: | DAVID B. SCOTT, UNIVERSITY OF CALIFORNIA; CHRISTIANE A. SCOTT, UNIVERSITY OF CALIFORNIA; JOHANNA DOBEREINER, SNLCS.
Título: | Nitrogenase activity and nitrate respiration in Azospirillum spp.
Ano de publicação: | 1979
Fonte/Imprenta: | Archives of Microbiology, v. 121, n. 2, p. 141-145, 1979.
DOI: | https://doi.org/10.1007/BF00689978
Idioma: | Inglês
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.
Thesagro: | Fisiologia; Microrganismo.
Thesaurus Nal: | Azospirillum.
Categoria do assunto: | P Recursos Naturais, Ciências Ambientais e da Terra
Registro original: | Embrapa Solos (CNPS)
Exemplares: | CNPS - (20815-1) - UPC - AP - DD -  -  -  - DIS