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 | Acesso ao texto completo restrito à biblioteca da Embrapa Solos. Para informações adicionais entre em contato com cnps.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Arroz e Feijão; Embrapa Solos. |
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Data corrente: |
22/04/1997 |
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Data da última atualização: |
06/03/2024 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
PEREIRA, P. A. A.; BALDANI, J. I.; DOBEREINER, J.; NEYRA, C. A. |
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Afiliação: |
PEDRO ANTONIO ARRAES PEREIRA, CNPAF; JOSE IVO BALDANI, CNPAB; JOHANNA DOBEREINER, CNPAB; CARLOS A. NEYRA. |
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Título: |
Nitrate reduction and nitrogenase activity in excised corn roots. |
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Ano de publicação: |
1981 |
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Fonte/Imprenta: |
Canadian Journal of Botany, v. 59, n. 12, p. 2445-2449, Dec. 1981. |
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DOI: |
https://doi.org/10.1139/b81-295 |
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Idioma: |
Inglês |
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Conteúdo: |
Root segments obtained from field-grown corn plants were divided into small sections and assayed for acetylene (C2H2) reduction. After overnight preincubation, C2H2 reduction started immediately and linear rates were observed for several hours. Addition of NO3-(1 mM) delayed the start of C2H2 reduction but linear rates followed thereafter. A similar pattern was observed with excised roots inoculated with Azospirillum lipoferum. Addition of malate did not eliminate the NO3- effect. Inoculation with A. lipoferum resulted in relatively large rates of C2H2 reduction and a shorter lag than normal (4 to 8 h). A transient accumulation of NO2- accompanied the disappearance of NO3- and C2H2 reduction started only after all the NO2- had been reduced. A very sizable fraction of the reduced NO3- and NO2- was accounted for as N2O accumulation. Thus, the results provided support for the in situ operation of both N2 fixation and denitrification in A. lipoferum - corn root associations and it is proposed that mature corn roots are able to provide sufficient carbon to support both processes. |
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Palavras-Chave: |
Denitrificacao; Reducao de acetileno. |
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Thesagro: |
Fixação de Nitrogênio; Milho. |
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Thesaurus NAL: |
acetylene reduction; Azospirillum; denitrification. |
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Categoria do assunto: |
F Plantas e Produtos de Origem Vegetal |
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Marc: |
LEADER 01845naa a2200253 a 4500
001 1203714
005 2024-03-06
008 1981 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1139/b81-295$2DOI
100 1 $aPEREIRA, P. A. A.
245 $aNitrate reduction and nitrogenase activity in excised corn roots.$h[electronic resource]
260 $c1981
520 $aRoot segments obtained from field-grown corn plants were divided into small sections and assayed for acetylene (C2H2) reduction. After overnight preincubation, C2H2 reduction started immediately and linear rates were observed for several hours. Addition of NO3-(1 mM) delayed the start of C2H2 reduction but linear rates followed thereafter. A similar pattern was observed with excised roots inoculated with Azospirillum lipoferum. Addition of malate did not eliminate the NO3- effect. Inoculation with A. lipoferum resulted in relatively large rates of C2H2 reduction and a shorter lag than normal (4 to 8 h). A transient accumulation of NO2- accompanied the disappearance of NO3- and C2H2 reduction started only after all the NO2- had been reduced. A very sizable fraction of the reduced NO3- and NO2- was accounted for as N2O accumulation. Thus, the results provided support for the in situ operation of both N2 fixation and denitrification in A. lipoferum - corn root associations and it is proposed that mature corn roots are able to provide sufficient carbon to support both processes.
650 $aacetylene reduction
650 $aAzospirillum
650 $adenitrification
650 $aFixação de Nitrogênio
650 $aMilho
653 $aDenitrificacao
653 $aReducao de acetileno
700 1 $aBALDANI, J. I.
700 1 $aDOBEREINER, J.
700 1 $aNEYRA, C. A.
773 $tCanadian Journal of Botany$gv. 59, n. 12, p. 2445-2449, Dec. 1981.
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Registro original: |
Embrapa Arroz e Feijão (CNPAF) |
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