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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. |
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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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Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
URL |
Voltar
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Registro Completo
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Biblioteca(s): |
Embrapa Solos. |
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Data corrente: |
03/02/2020 |
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Data da última atualização: |
21/07/2020 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
A - 2 |
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Autoria: |
ALVES, R. B. de O.; SILVA, H. P. da; ARAUJO FILHO, J. C. de; DOMINGUES, M. A. de O.; ALBUQUERQUE, J. O. de. |
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Afiliação: |
RAYANNA BARROSO DE OLIVEIRA ALVES, UFRPE; HERNANDE PEREIRA DA SILVA, UFRPE; JOSE COELHO DE ARAUJO FILHO, CNPS; MARCO ANTONIO DE OLIVEIRA DOMINGUES, IFPE; JONES OLIVEIRA DE ALBUQUERQUE, UFRPE/UFPE. |
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Título: |
Use of Vegetation Cover Index (ICV) to identify susceptible areas to desertification process in the semiarid municipalities of Pernambuco, Brazil. |
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Ano de publicação: |
2020 |
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Fonte/Imprenta: |
International Journal of Advanced Engineering Research and Science, v. 7, n. 1, p. 53-63, Jan. 2020. |
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DOI: |
https://dx.doi.org/10.22161/ijaers.71.8 |
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Idioma: |
Inglês |
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Conteúdo: |
Climate change in Brazil has led to an increase in temperature and changes in the distribution of climatic extremes, such as droughts and floods. This is potentialized when it comes to the brasilian semi-arid Northeast. Environmental studies related to this theme are in constant development. For this, the geotechnologies are of great importance for the environmental studies, since they allow the acquisition and analysis of information of use of the ground, vegetal cover and phenomena of the nature. In the present work, the Vegetation Cover Index was studied using remote sensing and geoprocessing techniques through the digital processing of images acquired in the years 2000 to 2015 of the LANDSAT satellites of three municipalities of Pernambuco to observe the vegetation cover in the said temporal space with the degraded areas possibly resulting from the desertification process in the region. Thus, it was found that the municipalities of Betânia and Itacuruba have very high vulnerability (0.75 and 1, respectively). On the other hand, the municipality of Floresta presented a high vulnerability of ICV (0.5), as the vegetation deficit influences hydrological dynamics, soil protection, climatic stability and thermal influence, corroborating the desertification process. |
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Thesagro: |
Desertificação; Meio Ambiente; Mudança Climática. |
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Thesaurus NAL: |
Climate change; Desertification; Environment. |
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Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/210102/1/Use-of-Vegetation-Cover-Index-to-identify-susceptible-areas-to-desertification-process-2020.pdf
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Marc: |
LEADER 02181naa a2200253 a 4500
001 2119736
005 2020-07-21
008 2020 bl uuuu u00u1 u #d
024 7 $ahttps://dx.doi.org/10.22161/ijaers.71.8$2DOI
100 1 $aALVES, R. B. de O.
245 $aUse of Vegetation Cover Index (ICV) to identify susceptible areas to desertification process in the semiarid municipalities of Pernambuco, Brazil.$h[electronic resource]
260 $c2020
520 $aClimate change in Brazil has led to an increase in temperature and changes in the distribution of climatic extremes, such as droughts and floods. This is potentialized when it comes to the brasilian semi-arid Northeast. Environmental studies related to this theme are in constant development. For this, the geotechnologies are of great importance for the environmental studies, since they allow the acquisition and analysis of information of use of the ground, vegetal cover and phenomena of the nature. In the present work, the Vegetation Cover Index was studied using remote sensing and geoprocessing techniques through the digital processing of images acquired in the years 2000 to 2015 of the LANDSAT satellites of three municipalities of Pernambuco to observe the vegetation cover in the said temporal space with the degraded areas possibly resulting from the desertification process in the region. Thus, it was found that the municipalities of Betânia and Itacuruba have very high vulnerability (0.75 and 1, respectively). On the other hand, the municipality of Floresta presented a high vulnerability of ICV (0.5), as the vegetation deficit influences hydrological dynamics, soil protection, climatic stability and thermal influence, corroborating the desertification process.
650 $aClimate change
650 $aDesertification
650 $aEnvironment
650 $aDesertificação
650 $aMeio Ambiente
650 $aMudança Climática
700 1 $aSILVA, H. P. da
700 1 $aARAUJO FILHO, J. C. de
700 1 $aDOMINGUES, M. A. de O.
700 1 $aALBUQUERQUE, J. O. de
773 $tInternational Journal of Advanced Engineering Research and Science$gv. 7, n. 1, p. 53-63, Jan. 2020.
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