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Registro Completo |
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Biblioteca(s): |
Embrapa Soja. |
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Data corrente: |
13/01/2014 |
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Data da última atualização: |
31/07/2017 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
HUNGRIA, M.; KASCHUK, G. |
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Afiliação: |
MARIANGELA HUNGRIA DA CUNHA, CNPSO; GLACIELA KASCHUK, UNIPAR. |
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Título: |
Regulation of N2 fixation and NO3-/NH4+ assimilation in nodulated and N-fertilized Phaseolus vulgaris L. exposed to high temperature stress. |
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Ano de publicação: |
2014 |
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Fonte/Imprenta: |
Environmental and Experimental Botany, v. 98, p. 32-39, Feb. 2014. |
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DOI: |
http://dx.doi.org/10.1016/j.envexpbot.2013.10.010 |
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Idioma: |
Inglês |
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Conteúdo: |
Legumes need large amounts of N to grow satisfactorily. Under low NO3− availability in the soil, many legumes meet their N requirements by N2 fixation in association with rhizobia. Both NO3− uptake and N2 fixation decrease as temperature exceeds optimal growth conditions, but the mechanisms of regulation of N2 fixation and NO3−/NH4+ assimilation under high temperature stress are not completely understood. We describe an experiment in which physiological mechanisms regulating N metabolism of common bean (Phaseolus vulgaris L.) are investigated in plants submitted to daily maximum temperatures of 28, 34 and 39 °C. Common bean was grown in symbiosis with each of six rhizobial strains—belonging to four different species and varying in N2 fixation effectiveness—or fertilized with NO3− until flowering. Harvest measurements included the activities of shoot, stem and root NO3− reductase (NR), nodule glutamine synthetase (GS), NADH-dependent glutamate synthase (GOGAT), nitrogenase, phosphoenol pyruvate carboxylase (PEPcase), N-export rates by nodules and concentration of N compounds in the xylem sap. Higher temperatures inhibited N2 fixation resulting in lower proportion of ureide-N in nodules and xylem sap of nodulated plants in relation to amide-N and α-amino-N. Higher temperatures consistently reduced the activity of NR in leaves of N-fertilized plants. Higher temperatures also decreased N exported from nodules and activities of nitrogenase, GS, GOGAT and PEPcase. The rate of decreases varied in plants with different strains. Furthermore, the activities of GS and GOGAT were more strongly affected by high temperatures than the activity of nitrogenase. There was a remarkable increase in the concentration of NH4+-N and ureide-N in the nodules when GS and GOGAT activities decreased. Therefore, the results provide evidence that N2 fixation in common bean submitted to heat stress is limited by NH4+ assimilation via GS-GOGAT rather than by decreased activity of nitrogenase. Rhizobial effectiveness determined the degree of down-regulation of GS-GOGAT activity in nodule tissues. MenosLegumes need large amounts of N to grow satisfactorily. Under low NO3− availability in the soil, many legumes meet their N requirements by N2 fixation in association with rhizobia. Both NO3− uptake and N2 fixation decrease as temperature exceeds optimal growth conditions, but the mechanisms of regulation of N2 fixation and NO3−/NH4+ assimilation under high temperature stress are not completely understood. We describe an experiment in which physiological mechanisms regulating N metabolism of common bean (Phaseolus vulgaris L.) are investigated in plants submitted to daily maximum temperatures of 28, 34 and 39 °C. Common bean was grown in symbiosis with each of six rhizobial strains—belonging to four different species and varying in N2 fixation effectiveness—or fertilized with NO3− until flowering. Harvest measurements included the activities of shoot, stem and root NO3− reductase (NR), nodule glutamine synthetase (GS), NADH-dependent glutamate synthase (GOGAT), nitrogenase, phosphoenol pyruvate carboxylase (PEPcase), N-export rates by nodules and concentration of N compounds in the xylem sap. Higher temperatures inhibited N2 fixation resulting in lower proportion of ureide-N in nodules and xylem sap of nodulated plants in relation to amide-N and α-amino-N. Higher temperatures consistently reduced the activity of NR in leaves of N-fertilized plants. Higher temperatures also decreased N exported from nodules and activities of nitrogenase, GS, ... Mostrar Tudo |
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Palavras-Chave: |
Fixação biológica de nitrogênio. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02719naa a2200157 a 4500
001 1975792
005 2017-07-31
008 2014 bl uuuu u00u1 u #d
024 7 $ahttp://dx.doi.org/10.1016/j.envexpbot.2013.10.010$2DOI
100 1 $aHUNGRIA, M.
245 $aRegulation of N2 fixation and NO3-/NH4+ assimilation in nodulated and N-fertilized Phaseolus vulgaris L. exposed to high temperature stress.
260 $c2014
520 $aLegumes need large amounts of N to grow satisfactorily. Under low NO3− availability in the soil, many legumes meet their N requirements by N2 fixation in association with rhizobia. Both NO3− uptake and N2 fixation decrease as temperature exceeds optimal growth conditions, but the mechanisms of regulation of N2 fixation and NO3−/NH4+ assimilation under high temperature stress are not completely understood. We describe an experiment in which physiological mechanisms regulating N metabolism of common bean (Phaseolus vulgaris L.) are investigated in plants submitted to daily maximum temperatures of 28, 34 and 39 °C. Common bean was grown in symbiosis with each of six rhizobial strains—belonging to four different species and varying in N2 fixation effectiveness—or fertilized with NO3− until flowering. Harvest measurements included the activities of shoot, stem and root NO3− reductase (NR), nodule glutamine synthetase (GS), NADH-dependent glutamate synthase (GOGAT), nitrogenase, phosphoenol pyruvate carboxylase (PEPcase), N-export rates by nodules and concentration of N compounds in the xylem sap. Higher temperatures inhibited N2 fixation resulting in lower proportion of ureide-N in nodules and xylem sap of nodulated plants in relation to amide-N and α-amino-N. Higher temperatures consistently reduced the activity of NR in leaves of N-fertilized plants. Higher temperatures also decreased N exported from nodules and activities of nitrogenase, GS, GOGAT and PEPcase. The rate of decreases varied in plants with different strains. Furthermore, the activities of GS and GOGAT were more strongly affected by high temperatures than the activity of nitrogenase. There was a remarkable increase in the concentration of NH4+-N and ureide-N in the nodules when GS and GOGAT activities decreased. Therefore, the results provide evidence that N2 fixation in common bean submitted to heat stress is limited by NH4+ assimilation via GS-GOGAT rather than by decreased activity of nitrogenase. Rhizobial effectiveness determined the degree of down-regulation of GS-GOGAT activity in nodule tissues.
653 $aFixação biológica de nitrogênio
700 1 $aKASCHUK, G.
773 $tEnvironmental and Experimental Botany$gv. 98, p. 32-39, Feb. 2014.
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Registro original: |
Embrapa Soja (CNPSO) |
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Biblioteca |
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Origem |
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Classificação |
Cutter |
Registro |
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URL |
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Registro Completo
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Biblioteca(s): |
Embrapa Suínos e Aves. |
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Data corrente: |
07/10/1998 |
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Data da última atualização: |
15/04/2015 |
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Tipo da produção científica: |
Documentos |
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Autoria: |
IRGANG, R.; FAVERO, J. A. |
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Afiliação: |
RENATO IRGANG, CNPSA; JERÔNIMO ANTONIO FÁVERO, CNPSA. |
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Título: |
Catalogo de reprodutores suinos das racas Duroc, Landrace e Large white. |
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Ano de publicação: |
1995 |
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Fonte/Imprenta: |
Concordia: EMBRAPA-CNPSA, 1995. |
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Páginas: |
23p. |
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Série: |
(EMBRAPA-CNPSA. Documentos, 35) |
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Idioma: |
Português |
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Conteúdo: |
Lista dos 50 melhores machos da raca Duroc; Lista das 200 melhores femeas da raca Duroc; Lista dos 50 melhores machos da raca Landrace; Lista das 200 melhores femeas da raca Landrace; Lista dos 50 melhores machos da raca Large White; Lista das 200 melhores femeas da raca Large White. |
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Palavras-Chave: |
Catalogo; Catalogue; Racas; Race. |
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Thesagro: |
Suíno. |
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Thesaurus NAL: |
swine. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/67735/1/CUsersPiazzonDocumentsProntosCNPSA-DOCUMENTOS-35-CATALOGO-DE-REPRODUTORES-SUINOS-DAS-RACAS-DUROC-LANDRACE-E-LARGE-WHITE-FL-127.pdf
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Marc: |
LEADER 00824nam a2200217 a 4500
001 1433730
005 2015-04-15
008 1995 bl uuuu u0uu1 u #d
100 1 $aIRGANG, R.
245 $aCatalogo de reprodutores suinos das racas Duroc, Landrace e Large white.
260 $aConcordia: EMBRAPA-CNPSA$c1995
300 $a23p.
490 $a(EMBRAPA-CNPSA. Documentos, 35)
520 $aLista dos 50 melhores machos da raca Duroc; Lista das 200 melhores femeas da raca Duroc; Lista dos 50 melhores machos da raca Landrace; Lista das 200 melhores femeas da raca Landrace; Lista dos 50 melhores machos da raca Large White; Lista das 200 melhores femeas da raca Large White.
650 $aswine
650 $aSuíno
653 $aCatalogo
653 $aCatalogue
653 $aRacas
653 $aRace
700 1 $aFAVERO, J. A.
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