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| Registros recuperados : 91 | |
| 41. |  | OLIVEIRA, M. W. de; TRIVELIN, P. C. O.; PENATTI, C. P.; PICCOLO, M. de C. Decomposição e liberação de nutrientes da palhada de cana-de-açúcar em campo. Pesquisa Agropecuária Brasileira, Brasília, DF, v. 34, n. 12, p. 2359-2362, nov. 1999. Notas Científicas.
Título em inglês: Field decomposition and release of sugar cane trash nutrients.| Biblioteca(s): Embrapa Unidades Centrais. |
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| 45. | | OTTO, R.; FRANCO, H. C. J.; FARONI, C. E.; VITTI, A. C.; TRIVELIN, P. C. O. Fitomassa de raízes e da parte aérea da cana-de-açúcar relacionada à adubação nitrogenada de plantio. Pesquisa Agropecuária Brasileira, Brasília, DF, v. 44, n. 4, p. 398-405, abr. 2009 Título em inglês: Sugarcane root and shoot phytomass related to nitrogen fertilization at planting.| Biblioteca(s): Embrapa Solos / UEP-Recife; Embrapa Unidades Centrais. |
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| 49. | | GAVA, G. J. de C.; TRIVELIN, P. C. O.; OLIVEIRA, M. W. de; PENATTI, C. P. Crescimento e acúmulo de nitrogênio em cana-de-açucar cultivada em solo coberto com palhada. Pesquisa Agropecuária Brasileira, Brasília, DF, v. 36, n. 11, p. 1347-1354, nov. 2001 Título em inglês: Growth and accumulation of nitrogen by sugarcane cultivated in soil covered with cane trash.| Biblioteca(s): Embrapa Unidades Centrais. |
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| 50. | | MASCARENHAS, H. A. A.; MURAOKA, T.; TANAKA, R. T.; AMBROSANO, E. J.; TRIVELIN, P. C. O. Crescimento da planta e absorcao de N em funcao da inoculacao com rizobio e adubacao mineral em soja nodulante e nao-nodulante. Revista de Agricultura, Piracicaba, v.75, n.3, p.359-371, 2000.| Biblioteca(s): Embrapa Soja. |
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| 51. | | GAVA, G. J. de C.; TRIVELIN, P. C. O.; VITTI, A. C.; OLIVEIRA, M. W. de. Urea and sugarcane straw nitrogen balance in a soil-sugarcane crop system. Pesquisa Agropecuária Brasileira, Brasília, DF, v. 40, n. 7, p. 689-695, jul. 2005 Título em português: Balanço do nitrogênio da uréia e da palha de cana no sistema solo-cana-de-açúcar.| Biblioteca(s): Embrapa Unidades Centrais. |
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| 54. | | CABEZAS, W. A. R. L.; ARRUDA, M. R. de; CANTARELLA, H.; PAULETTI, V.; TRIVELIN, P. C. O.; BENDASSOLLI, J. A. Imobilização de nitrogênio da uréia e do sulfato de amônio aplicado em pré-semeadura ou cobertura na cultura de milho, no sistema plantio direto. Revista Brasileira de Ciência do Solo, Viçosa, v. 29, n. 2, p. 215-226, 2005.| Biblioteca(s): Embrapa Amazônia Ocidental. |
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| 56. | | MARTHA JUNIOR, G. B.; CORSI, M.; MAULE, R. F.; TRIVELIN, P. C. O.; ROVARI, R.; PASSONI JUNIOR, J. C. Métodos de determinação da área basal de uma pastagem de capim-elefante. Scientia Agricola, Piracicaba, v. 56, n. 3, p. 645-649, jul. 1999.| Biblioteca(s): Embrapa Caprinos e Ovinos. |
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| 58. | | FORTES, C.; TRIVELIN, P. C. O.; VITTI, A. C.; OTTO, R.; FRANCO, H. C. J.; FARONI, C. E. Stalk and sucrose yield in response to nitrogen fertilization of sugarcane under reduced tillage. Pesquisa Agropecuária Brasileira, Brasília, DF, v. 48, n. 1, p. 88-96, jan. 2013. Título em português: Produtividade de colmo e sacarose em resposta à adubação nitrogenada da cana-de-açúcar, sob preparo reduzido.| Biblioteca(s): Embrapa Unidades Centrais. |
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| 59. | | MEGDA, M. X. V.; TRIVELIN, P. C. O.; FRANCO, H. C. J.; OTTO, R.; VITTI, A. C. Eficiência agronômica de adubos nitrogenados em soqueira de cana-de-açúcar colhida sem queima. Pesquisa Agropecuária Brasileira, Brasília, DF, v. 47, n. 12, p. 1681-1690, dez. 2012. Título em inglês: Agronomic efficiency of nitrogen fertilizers on green harvesting sugarcane ratoon.| Biblioteca(s): Embrapa Unidades Centrais. |
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| 60. | | BRANCO, R. B. F.; GOTO, R.; CARNEIRO JÚNIO, A. G.; GUIMARÃES, V. F.; RODRIGUES, J. D.; TRIVELIN, P. C. O. Transporte do N e produtividade do tomateiro enxertado irrigado com água carbonatada. Horticultura Brasileira, Brasília, DF, v. 25, n. 1, p. 77-81, jan./mar. 2007.| Biblioteca(s): Embrapa Hortaliças. |
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| Registros recuperados : 91 | |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Meio Ambiente. Para informações adicionais entre em contato com cnpma.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Meio Ambiente. |
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Data corrente: |
24/02/2016 |
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Data da última atualização: |
16/10/2020 |
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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: |
EPRON, D.; CABRAL, O. M. R.; LACLAU, J.-P.; DANNOURA, M.; PACKER, A. P.; PLAIN, C.; BATTIE-LACLAU, P.; MOREIRA, M. Z.; TRIVELIN, P. C. O.; BOUILLET, J-P.; GÉRANT, D.; NOUVELLON, Y. |
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Afiliação: |
DANIEL EPRON, Université de Lorraine; OSVALDO MACHADO RODRIGUES CABRAL, CNPMA; JEAN-PAUL LACLAU, CIRAD; MASAKO DANNOURA, Kyoto University; ANA PAULA CONTADOR PACKER, CNPMA; CAROLINE PLAIN, INRA; PATRICIA BATTIE-LACLAU, CENA-USP; MARCELO ZACHARIAS MOREIRA, CENA-USP; PAULO CESAR OCHEUZE TRIVELIN, CENA-USP; JEAN-PIERRE BOUILLET, ESALQ-USP; DOMINIQUE GERANT, Université de Lorraine; YANN NOUVELLON, IAG-USP. |
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Título: |
In situ 13CO2 pulse labelling of field-grown eucalypt trees revealed the effects of potassium nutrition and throughfall exclusion on phloem transport of photosynthetic carbon. |
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Ano de publicação: |
2016 |
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Fonte/Imprenta: |
Tree Physiology, Oxford, v. 36, n. 1, p. 6-21, 2016. |
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Idioma: |
Inglês |
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Conteúdo: |
Abstract: Potassium (K) is an important limiting factor of tree growth, but little is known of the effects of K supply on the long-distance transport of photosynthetic carbon (C) in the phloem and of the interaction between K fertilization and drought. We pulselabelled 2-year-old Eucalyptus grandis L. trees grown in a field trial combining K fertilization (+K and -K) and throughfall exclusion (+W and -W), and we estimated the velocity of C transfer by comparing time lags between the uptake of 13CO2 and its recovery in trunk CO2 efflux recorded at different heights. We also analysed the dynamics of the labelled photosynthates recovered in the foliage and in the phloem sap (inner bark extract). The mean residence time of labelled C in the foliage was short (21?31 h). The time series of 13C in excess in the foliage was affected by the level of fertilization, whereas the effect of throughfall exclusion was not significant. The velocity of C transfer in the trunk (0.20?0.82 m h-1) was twice as high in +K trees than in -K trees, with no significant effect of throughfall exclusion except for one +K -W tree labelled in the middle of the drought season that was exposed to a more pronounced water stress (midday leaf water potential of -2.2 MPa). Our results suggest that besides reductions in photosynthetic C supply and in C demand by sink organs, the lower velocity under K deficiency is due to a lower cross-sectional area of the sieve tubes, whereas an increase in phloem sap viscosity is more likely limiting phloem transport under drought. In all treatments, 10 times less 13C was recovered in inner bark extracts at the bottom of the trunk when compared with the base of the crown, suggesting that a large part of the labelled assimilates has been exported out of the phloem and replaced by unlabelled C. This supports the ?leakage-retrieval mechanism? that may play a role in maintaining the pressure gradient between source and sink organs required to sustain high velocity of phloem transport in tall trees. MenosAbstract: Potassium (K) is an important limiting factor of tree growth, but little is known of the effects of K supply on the long-distance transport of photosynthetic carbon (C) in the phloem and of the interaction between K fertilization and drought. We pulselabelled 2-year-old Eucalyptus grandis L. trees grown in a field trial combining K fertilization (+K and -K) and throughfall exclusion (+W and -W), and we estimated the velocity of C transfer by comparing time lags between the uptake of 13CO2 and its recovery in trunk CO2 efflux recorded at different heights. We also analysed the dynamics of the labelled photosynthates recovered in the foliage and in the phloem sap (inner bark extract). The mean residence time of labelled C in the foliage was short (21?31 h). The time series of 13C in excess in the foliage was affected by the level of fertilization, whereas the effect of throughfall exclusion was not significant. The velocity of C transfer in the trunk (0.20?0.82 m h-1) was twice as high in +K trees than in -K trees, with no significant effect of throughfall exclusion except for one +K -W tree labelled in the middle of the drought season that was exposed to a more pronounced water stress (midday leaf water potential of -2.2 MPa). Our results suggest that besides reductions in photosynthetic C supply and in C demand by sink organs, the lower velocity under K deficiency is due to a lower cross-sectional area of the sieve tubes, whereas an increase in phloem sap viscosity... Mostrar Tudo |
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Palavras-Chave: |
Carbon isotope; Carbon transfer; v. |
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Thesagro: |
Carbono; Eucalipto; Eucalyptus Grandis; Fertilizante potássico; Seca. |
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Thesaurus NAL: |
Eucalyptus; Potassium fertilizers. |
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Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
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Marc: |
LEADER 03126naa a2200373 a 4500
001 2038387
005 2020-10-16
008 2016 bl uuuu u00u1 u #d
100 1 $aEPRON, D.
245 $aIn situ 13CO2 pulse labelling of field-grown eucalypt trees revealed the effects of potassium nutrition and throughfall exclusion on phloem transport of photosynthetic carbon.$h[electronic resource]
260 $c2016
520 $aAbstract: Potassium (K) is an important limiting factor of tree growth, but little is known of the effects of K supply on the long-distance transport of photosynthetic carbon (C) in the phloem and of the interaction between K fertilization and drought. We pulselabelled 2-year-old Eucalyptus grandis L. trees grown in a field trial combining K fertilization (+K and -K) and throughfall exclusion (+W and -W), and we estimated the velocity of C transfer by comparing time lags between the uptake of 13CO2 and its recovery in trunk CO2 efflux recorded at different heights. We also analysed the dynamics of the labelled photosynthates recovered in the foliage and in the phloem sap (inner bark extract). The mean residence time of labelled C in the foliage was short (21?31 h). The time series of 13C in excess in the foliage was affected by the level of fertilization, whereas the effect of throughfall exclusion was not significant. The velocity of C transfer in the trunk (0.20?0.82 m h-1) was twice as high in +K trees than in -K trees, with no significant effect of throughfall exclusion except for one +K -W tree labelled in the middle of the drought season that was exposed to a more pronounced water stress (midday leaf water potential of -2.2 MPa). Our results suggest that besides reductions in photosynthetic C supply and in C demand by sink organs, the lower velocity under K deficiency is due to a lower cross-sectional area of the sieve tubes, whereas an increase in phloem sap viscosity is more likely limiting phloem transport under drought. In all treatments, 10 times less 13C was recovered in inner bark extracts at the bottom of the trunk when compared with the base of the crown, suggesting that a large part of the labelled assimilates has been exported out of the phloem and replaced by unlabelled C. This supports the ?leakage-retrieval mechanism? that may play a role in maintaining the pressure gradient between source and sink organs required to sustain high velocity of phloem transport in tall trees.
650 $aEucalyptus
650 $aPotassium fertilizers
650 $aCarbono
650 $aEucalipto
650 $aEucalyptus Grandis
650 $aFertilizante potássico
650 $aSeca
653 $aCarbon isotope
653 $aCarbon transfer
653 $av
700 1 $aCABRAL, O. M. R.
700 1 $aLACLAU, J.-P.
700 1 $aDANNOURA, M.
700 1 $aPACKER, A. P.
700 1 $aPLAIN, C.
700 1 $aBATTIE-LACLAU, P.
700 1 $aMOREIRA, M. Z.
700 1 $aTRIVELIN, P. C. O.
700 1 $aBOUILLET, J-P.
700 1 $aGÉRANT, D.
700 1 $aNOUVELLON, Y.
773 $tTree Physiology, Oxford$gv. 36, n. 1, p. 6-21, 2016.
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