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| Registros recuperados : 18 | |
| 7. |  | NASCIMENTO FILHO, M. B.; MAGALHÃES, J. G. R.; FERNANDES, J. C.; PEREIRA, A. R. Influência da altura de corte sobre a sobrevivência das touças de Eucalyptus. Silvicultura, São Paulo, v. 8, n. 28, p. 389-390, 1983. Edição dos anais do 4º Congresso Florestal Brasileiro, 1982, Belo Horizonte.| Biblioteca(s): Embrapa Florestas. |
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| 8. | | TOWNSEND, C. R.; MAGALHAES, J. A.; COSTA, N. de L.; PEREIRA, R. C. de A. Estabelecimento de Acacia angustissima, sob diferentes densidades, em pastagens de Bachiaria brizantha cv. Marandu. In: CONGRESSO BRASILEIRO EM SISTEMAS AGROFLORESTAIS, 2., 1998, Belem. Sistemas Agroflorestais no Contexto da Qualidade Ambiental e Competitividade: resumos expandidos. Belem: Embrapa-CPATU, 1998. p.221-223.| Biblioteca(s): Embrapa Florestas. |
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| 11. | | COSTA, N. de L.; OLIVEIRA, J. R. da C.; PAULINO, V. T.; LIMA, J. A. de S.; MAGALHÃES, J. A. Avaliação agronômica de leguminosas arbustivas de uso múltiplo dem Ariquemes, Rondônia. In: CONGRESSO BRASILEIRO DE SISTEMAS AGROFLORESTAIS, 5., 2004, Curitiba. SAFs: desenvolvimento com proteção ambiental: anais. Colombo: Embrapa Florestas, 2004. p. 447-449| Biblioteca(s): Embrapa Florestas; Embrapa Meio-Norte. |
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| 12. | | RIBEIRO, E. P.; MAGALHÃES, J. L.; RODRIGUES, A. A.; RODRIGUES, D. A.; FRAZÃO, M. A.; RODRIGUES, C. L. Análise inicial do super clone de eucalipto adubado com lodo de efluente suíno. Pesquisa Florestal Brasileira, Colombo, v. 35, n. 84, p. 399-407, out./dez. 2015.| Biblioteca(s): Embrapa Florestas. |
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| 16. | | COSTA, N. de L.; MAGALHÃES, J. A.; TONWSEND, C. R.; PEREIRA, R. G. de A.; OLIVEIRA, J. R. da C. Seleção de leguminosas forrageiras para utilização em pastagens e sistemas silvipastoris em Rondônia. In: CONGRESSO BRASILEIRO DE SISTEMAS AGROFLORESTAIS, 5., 2004, Curitiba. SAFs: desenvolvimento com proteção ambiental: anais. Colombo: Embrapa Florestas, 2004. p. 444-446 (Embrapa Florestas. Documentos, 98).| Biblioteca(s): Embrapa Florestas; Embrapa Meio-Norte. |
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| 17. | | COSTA, N. de L.; MAGALHÃES, J. A.; TONWSEND, C. R.; PEREIRA, R. G. de; OLIVEIRA, J. R. da C. Produção e qualidade da forragem de Brachiaria brizantha cv. Marandu em um sistema silvipastoril. In: CONGRESSO BRASILEIRO DE SISTEMAS AGROFLORESTAIS, 5., 2004, Curitiba. SAFs: desenvolvimento com proteção ambiental: anais. Colombo: Embrapa Florestas, 2004. p. 119-121 (Embrapa Florestas. Documentos, 98).| Biblioteca(s): Embrapa Florestas; Embrapa Meio-Norte. |
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| 18. | | GUIMARÃES, D. P.; MOURA, V. P. G.; REZENDE, G. C.; MENDES, C. J.; MAGALHÃES, J. G. R.; ASSIS, T. F. de; ALMEIDA, M. R. de; RESENDE, M. E. A. de; SILVA, F. V. da. Avaliação silvicultural, dendrométrica e tecnológica de espécies de Eucalyptus. Planaltina, DF: EMBRAPA-CPAC, 1983. 73 p. (EMBRAPA-CPAC. Boletim de Pesquisa, 20).| Biblioteca(s): Embrapa Amapá; Embrapa Amazônia Ocidental; Embrapa Cerrados; Embrapa Florestas; Embrapa Meio-Norte; Embrapa Rondônia; Embrapa Semiárido; Embrapa Unidades Centrais. |
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| Registros recuperados : 18 | |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Milho e Sorgo. Para informações adicionais entre em contato com cnpms.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Milho e Sorgo. |
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Data corrente: |
22/12/2004 |
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Data da última atualização: |
30/05/2018 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
MAGALHAES, J. R. |
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Afiliação: |
EMBRAPA-CNPMS. |
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Título: |
Kinetics of 15NH4+ assimilation in tomato plants: evidence for 15NH4+ assimilation via GDH in tomato roots. |
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Ano de publicação: |
1991 |
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Fonte/Imprenta: |
Journal of Plant Nutrition, New York, v. 14, n. 12, p. 1341-1353, 1991. |
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Idioma: |
Inglês |
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Conteúdo: |
The kinetics of 15NH4+ assimilation into free amino acids and total reduced nitrogen were monitored in both roots and shoots of two week old tomato seedlings supplied with 5 mM 99% 15NH4)2S04 via lhe aerated root medium in hydroponic culture, in lhe presence and absence of a 2 h pre-incubation with 1 mM methionine sulfoximine (MSX). The labeling kinetics of amino acids in roots of tomato plants in lhe presence of MSX show that continued assimilation of 15NH4+ can occur when lhe GS/GOGAT cycle is inhibited. ln lhe presence of MSX, three amino acids [glutamate. alanine, and y-amino butyrate (GABA)] of lhe root tissue continue to become labeled with 15N under conditions where labeling of the amino-N moiety of glutamine is completely inhibited. This indicates primary ammonia assimilation via GDH, or altematively, assimilation of ammonia into alanine via alanine dehydrogenase. Free ammonia accumulates rapidly in both shoots and roots of tomato in response to MSX. The labeled ammonia accumulated in the roots in the presence of MSX must be largely derived from lhe medium whereas in shoots this ammonia appears to be derived from catabolism of unlabeled arnino acids and proteins. The pools of glutamine, glutamate and alanine after 24 h exposure to 15NH4+ were, on lhe average. 5- to 10-fold lower in lhe MSX-treated than in the control (-MSX) shoots and roots. ln contrast, lhe pools of valine, leucine, isoleucine, proline, threonine, phenylalanine, lysine, and tyrosine increased 5- to 10-fold above lhe control values in lhe shoots of MSX-treated plants, and 2- to 4-fold above control values in the roots of MSX-treated tomato plants after 24 h. The latter amino acids alI exhibited low isotope abundance, and presumably were derived from protein turnover. MenosThe kinetics of 15NH4+ assimilation into free amino acids and total reduced nitrogen were monitored in both roots and shoots of two week old tomato seedlings supplied with 5 mM 99% 15NH4)2S04 via lhe aerated root medium in hydroponic culture, in lhe presence and absence of a 2 h pre-incubation with 1 mM methionine sulfoximine (MSX). The labeling kinetics of amino acids in roots of tomato plants in lhe presence of MSX show that continued assimilation of 15NH4+ can occur when lhe GS/GOGAT cycle is inhibited. ln lhe presence of MSX, three amino acids [glutamate. alanine, and y-amino butyrate (GABA)] of lhe root tissue continue to become labeled with 15N under conditions where labeling of the amino-N moiety of glutamine is completely inhibited. This indicates primary ammonia assimilation via GDH, or altematively, assimilation of ammonia into alanine via alanine dehydrogenase. Free ammonia accumulates rapidly in both shoots and roots of tomato in response to MSX. The labeled ammonia accumulated in the roots in the presence of MSX must be largely derived from lhe medium whereas in shoots this ammonia appears to be derived from catabolism of unlabeled arnino acids and proteins. The pools of glutamine, glutamate and alanine after 24 h exposure to 15NH4+ were, on lhe average. 5- to 10-fold lower in lhe MSX-treated than in the control (-MSX) shoots and roots. ln contrast, lhe pools of valine, leucine, isoleucine, proline, threonine, phenylalanine, lysine, and tyrosine increased 5- to ... Mostrar Tudo |
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Thesagro: |
Tomate. |
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Categoria do assunto: |
S Ciências Biológicas |
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Marc: |
LEADER 02222naa a2200133 a 4500
001 1488559
005 2018-05-30
008 1991 bl uuuu u00u1 u #d
100 1 $aMAGALHAES, J. R.
245 $aKinetics of 15NH4+ assimilation in tomato plants$bevidence for 15NH4+ assimilation via GDH in tomato roots.$h[electronic resource]
260 $c1991
520 $aThe kinetics of 15NH4+ assimilation into free amino acids and total reduced nitrogen were monitored in both roots and shoots of two week old tomato seedlings supplied with 5 mM 99% 15NH4)2S04 via lhe aerated root medium in hydroponic culture, in lhe presence and absence of a 2 h pre-incubation with 1 mM methionine sulfoximine (MSX). The labeling kinetics of amino acids in roots of tomato plants in lhe presence of MSX show that continued assimilation of 15NH4+ can occur when lhe GS/GOGAT cycle is inhibited. ln lhe presence of MSX, three amino acids [glutamate. alanine, and y-amino butyrate (GABA)] of lhe root tissue continue to become labeled with 15N under conditions where labeling of the amino-N moiety of glutamine is completely inhibited. This indicates primary ammonia assimilation via GDH, or altematively, assimilation of ammonia into alanine via alanine dehydrogenase. Free ammonia accumulates rapidly in both shoots and roots of tomato in response to MSX. The labeled ammonia accumulated in the roots in the presence of MSX must be largely derived from lhe medium whereas in shoots this ammonia appears to be derived from catabolism of unlabeled arnino acids and proteins. The pools of glutamine, glutamate and alanine after 24 h exposure to 15NH4+ were, on lhe average. 5- to 10-fold lower in lhe MSX-treated than in the control (-MSX) shoots and roots. ln contrast, lhe pools of valine, leucine, isoleucine, proline, threonine, phenylalanine, lysine, and tyrosine increased 5- to 10-fold above lhe control values in lhe shoots of MSX-treated plants, and 2- to 4-fold above control values in the roots of MSX-treated tomato plants after 24 h. The latter amino acids alI exhibited low isotope abundance, and presumably were derived from protein turnover.
650 $aTomate
773 $tJournal of Plant Nutrition, New York$gv. 14, n. 12, p. 1341-1353, 1991.
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