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47. | ![Imagem marcado/desmarcado](/consulta/web/img/desmarcado.png) | GRANGE, L.; HUNGRIA, M. Diversidade de rizobio capaz de nodular o feijoeiro isolado de solos da Regiao Nordeste e da Regiao Sul do Brasil. Genetics and Molecular Biology, Ribeirao Preto, v.23, n.3, p.353-354, Sept. 2000. Supplement. Trabalho apresentado no 46, Congresso Nacional de Genetica, 19 a 23 de setembro de 2000, Aguas de Lindoia, SP. Biblioteca(s): Embrapa Soja. |
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50. | ![Imagem marcado/desmarcado](/consulta/web/img/desmarcado.png) | HUNGRIA, M.; MEGÍAS, M. Uma década de ouro se aproxima para a microbiologia do solo: expectativas da pesquisa, da indústria, dos agricultores e da sociedade. In: IBEROAMERICAN CONFERENCE ON BENEFICIAL PLANT - MICROORGANISM - ENVIRONMENT INTERACTIONS, 2.; NATIONAL MEETING OF THE SPANISH SOCIETY OF NITROGEN FIXATION, 14.; LATIN AMERICAN MEETING ON RHIZOBIOLOGY, 26.; SPANISH-PROTUGUESE CONGRESS ON NITROGEN FIXATION, 3., 2013, Sevilla. Microorganisms for future agriculture. Sevilla: Universidad de Sevilla; ALAR; SEFIN, 2013. p. 510-517. Biblioteca(s): Embrapa Soja. |
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55. | ![Imagem marcado/desmarcado](/consulta/web/img/desmarcado.png) | THOMAS, R.; HUNGRIA, M. South-South initiative for training and capacity building for the management of soil biology/biodiversity. In: INTERNATIONAL TECHNICAL WORKSHOP ON BIOLOGICAL MANAGEMENT OF SOIL ECOSYSTEMS FOR SUSTAINABLE AGRICULTURE, 2002, Londrina. Program, abstracts and related documents. Londrina: Embrapa Soybean: FAO, 2002. p. 140-142. (Embrapa Soja. Documentos, 182). Organizado por George G. Brown, Mariangela Hungria, Lenita Jacob Oliveira, Sally Bunning, Adriana Montañez. Biblioteca(s): Embrapa Soja. |
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Registro Completo
Biblioteca(s): |
Embrapa Soja. |
Data corrente: |
13/01/2014 |
Data da última atualização: |
31/07/2017 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
Circulação/Nível: |
A - 1 |
Autoria: |
HUNGRIA, M.; KASCHUK, G. |
Afiliação: |
MARIANGELA HUNGRIA DA CUNHA, CNPSO; GLACIELA KASCHUK, UNIPAR. |
Título: |
Regulation of N2 fixation and NO3-/NH4+ assimilation in nodulated and N-fertilized Phaseolus vulgaris L. exposed to high temperature stress. |
Ano de publicação: |
2014 |
Fonte/Imprenta: |
Environmental and Experimental Botany, v. 98, p. 32-39, Feb. 2014. |
DOI: |
http://dx.doi.org/10.1016/j.envexpbot.2013.10.010 |
Idioma: |
Inglês |
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 |
Palavras-Chave: |
Fixação biológica de nitrogênio. |
Categoria do assunto: |
-- |
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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