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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. |
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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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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: |
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Registro original: |
Embrapa Meio Ambiente (CNPMA) |
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| 6. |  | COLARES, L. M. L.; QUISEN, R. C.; LIMA, G. C.; SAMPAIO, P. de T. B. Estaquia de castanheira-do-Brasil: influência de substratos, suplementação mineral e ácido bórico no enraizamento adventício. In: CONGRESSO BRASILEIRO DE FLORICULTURA E PLANTAS ORNAMENTAIS, 19.; CONGRESSO BRASILEIRO DE CULTURA DE TECIDOS DE PLANTAS, 6., 2013, Recife. Inovação tecnológica: resgate histórico, desafios e perspectivas. Recife: UFRPE, 2013. 1 CD-ROM.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Amazônia Ocidental. |
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| 11. | | SANTOS, R. P.; ANGELO, P. C. da S.; SAMPAIO, P. de T. B.; QUISEN, R. C.; LEITE, A. C. Alto grau de diversidade genética em populações naturais de pau-rosa (Aniba rosaeodora Ducke), no Estado do Amazonas. In: SIMPÓSIO BRASILEIRO DE PÓS-GRADUAÇÃO EM ENGENHARIA FLORESTAL, 3.; ENCONTRO AMAZÔNICO DE CIÊNCIAS FLORESTAIS, 1., 2004, Manaus. Livro de anais. Manaus: INPA: UFAM, 2004. 1 CD-ROM.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Amazônia Ocidental. |
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| 12. | | RESENDE, M. D. V. de; ARAUJO, A. J. de; SAMPAIO, P. de T. B.; WIECHETECK, M. S. S. Acurácia seletiva, intervalos de confiança e variâncias de ganhos genéticos associados a 22 métodos de seleção em Pinus caribaea var. hondurensis. Floresta, Curitiba, v. 25, n. 1/2, p. 3-16, jun./dez. 1995.| Biblioteca(s): Embrapa Florestas. |
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| 14. | | BENTO, R. A.; NOVAIS, C. B. de; SAGGIN JUNIOR, O. J.; OLIVEIRA, L. A. de; SAMPAIO, P. de T. B. Pioneer Tree Bellucia imperialis (Melastomataceae) from Central Amazon with seedlings highly dependent on arbuscular mycorrhizal fungi. Journal of Fungi, , v. 9, n. 5, 540, 2023.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: A - 2 |
| Biblioteca(s): Embrapa Agrobiologia. |
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| 15. | | SANTOS, R. P.; ANGELO, P. C. da S.; QUISEN, R. C.; OLIVEIRA, C. L.; SAMPAIO, P. de T. B. RAPD em pau-rosa (Aniba rosaeodora Ducke): adaptação do método para coleta de amostras in situ, ajuste das condições de PCR e apresentação de um processo para selecionar bandas reprodutíveis. Acta Amazônica, Manaus, v. 37, n. 2, p. 253-260, jun. 2007.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: Nacional - A |
| Biblioteca(s): Embrapa Amazônia Ocidental. |
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| 17. | | SANTOS, R. P.; ANGELO, P. C. da S.; SAMPAIO, P. de T. B.; QUISEN, R. C.; LEITE, A. M. C.; OLIVEIRA, C. L. de. Geographic pattern of genetic diversity in natural populations of rosewood (Aniba rosaeodora), in the Central Amazonia. Acta Amazônica, v. 38, n. 3, p. 459-466, set. 2008.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: Nacional - A |
| Biblioteca(s): Embrapa Amazônia Ocidental. |
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| 18. | | RAMOS, S. L. F.; LOPES, M. T. G.; SAMPAIO, P. de T. B.; CHAGAS, E. A.; PASQUAL, M.; SILVA, P. P. da. Tipo de explante e diferentes concentrações de sais em meio de cultura MS no estabelecimento in vitro de Aniba canelilla. Revista de Ciências Agrárias., v. 56, n. 4, p. 376-379, out./dez. 2013| Tipo: Artigo em Periódico Indexado | Circulação/Nível: B - 2 |
| Biblioteca(s): Embrapa Roraima. |
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| Registros recuperados : 18 | |
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