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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: |
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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Embrapa Meio Ambiente (CNPMA) |
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Registro Completo
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Biblioteca(s): |
Embrapa Soja; Embrapa Tabuleiros Costeiros. |
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Data corrente: |
30/10/2009 |
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Data da última atualização: |
28/03/2022 |
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Tipo da produção científica: |
Artigo em Anais de Congresso / Nota Técnica |
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Autoria: |
CARVALHO, H. W. L. de; OLIVEIRA, I. R. de; CARVALHO, C. G. P.; LIRA, M. A.; FERREIRA, F. M. de B.; RANGEL, J. H. de A.; FEITOSA, L. F.; RODRIGUES, C. S.; MENEZES, A. F.; MELO, K. E. de O. |
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Afiliação: |
HELIO WILSON LEMOS DE CARVALHO, CPATC; IVENIO RUBENS DE OLIVEIRA, CPATC; CLAUDIO GUILHERME PORTELA CARVALHO, CNPSo; MARCELO ABDON LIRA, EMPARN; FRANCISCO MERICLES DE BRITO FERREIRA, SECRETARIA DE AGRICULTURA DO ESTADO DE ALAGOAS; JOSE HENRIQUE DE ALBUQUERQUE RANGEL, CPATC; LIVIA FREIRE FEITOSA, UFS; CINTHIA SOUZA RODRIGES, UFS; ALBA FREITAS MENEZES, UFS; KATIA ESTELINA DE OLIVEIRA MELO, UFS. |
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Título: |
Avaliação de genótipos de girassol do ensaio final do segundo ano no nordeste brasileiro, no ano agrícola de 2007. |
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Ano de publicação: |
2009 |
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Fonte/Imprenta: |
In: REUNIÃO NACIONAL DE PESQUISA DO GIRASSOL, 18., SIMPÓSIO NACIONAL SOBRE A CULTURA DO GIRASSOL, 6., 2009. Pelotas. Anais... Pelotas: Embrapa Clima Temperado, 2009. 388 p. Editado por Ana Claudia Barneche de Oliveira, Ana Paula Afonso Scheneid da Rosa e Márcia Vizzotto. |
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Páginas: |
p. 109113. |
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Descrição Física: |
Artigo em anais. |
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Idioma: |
Português |
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Conteúdo: |
O objetivo deste trabalho foi averiguar o comportamento produtivo de dezesseis cultivares, do Ensaio Final de Segundo Ano, organizado Pela Embrapa Soja, em cinco ambientes inseridos em áreas do agreste do Nordeste brasileiro, no ano agrícola de 2007. Utilizou-se o delineamento experimental em blocos ao acaso com quatro repetições. Na análise de variância conjunta observaram-se diferenças entre os genótipos e os ambientes e inconsistência no comportamento desses genótipos perante às condições ambientais. Os genótipos HLA 886, BRS Gira 10, BRS Gira 08, EXP 1447, HLA 961, M 734, Agrobel 960 e EXP 1446 mostraram melhor adaptação, o que os torna de grande importância para exploração comercial em áreas do agreste nordestino. |
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Palavras-Chave: |
Genética de planta; Sunflower. |
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Thesagro: |
Genótipo; Girassol; Helianthus Annuus. |
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Thesaurus NAL: |
Genotype. |
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Categoria do assunto: |
--
F Plantas e Produtos de Origem Vegetal |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/233012/1/016.pdf
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/34734/1/29876.pdf
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Marc: |
LEADER 01875nam a2200301 a 4500
001 1662594
005 2022-03-28
008 2009 bl uuuu u00u1 u #d
100 1 $aCARVALHO, H. W. L. de
245 $aAvaliação de genótipos de girassol do ensaio final do segundo ano no nordeste brasileiro, no ano agrícola de 2007.
260 $aIn: REUNIÃO NACIONAL DE PESQUISA DO GIRASSOL, 18., SIMPÓSIO NACIONAL SOBRE A CULTURA DO GIRASSOL, 6., 2009. Pelotas. Anais... Pelotas: Embrapa Clima Temperado, 2009. 388 p. Editado por Ana Claudia Barneche de Oliveira, Ana Paula Afonso Scheneid da Rosa e Márcia Vizzotto.$c2009
300 $ap. 109113.$cArtigo em anais.
520 $aO objetivo deste trabalho foi averiguar o comportamento produtivo de dezesseis cultivares, do Ensaio Final de Segundo Ano, organizado Pela Embrapa Soja, em cinco ambientes inseridos em áreas do agreste do Nordeste brasileiro, no ano agrícola de 2007. Utilizou-se o delineamento experimental em blocos ao acaso com quatro repetições. Na análise de variância conjunta observaram-se diferenças entre os genótipos e os ambientes e inconsistência no comportamento desses genótipos perante às condições ambientais. Os genótipos HLA 886, BRS Gira 10, BRS Gira 08, EXP 1447, HLA 961, M 734, Agrobel 960 e EXP 1446 mostraram melhor adaptação, o que os torna de grande importância para exploração comercial em áreas do agreste nordestino.
650 $aGenotype
650 $aGenótipo
650 $aGirassol
650 $aHelianthus Annuus
653 $aGenética de planta
653 $aSunflower
700 1 $aOLIVEIRA, I. R. de
700 1 $aCARVALHO, C. G. P.
700 1 $aLIRA, M. A.
700 1 $aFERREIRA, F. M. de B.
700 1 $aRANGEL, J. H. de A.
700 1 $aFEITOSA, L. F.
700 1 $aRODRIGUES, C. S.
700 1 $aMENEZES, A. F.
700 1 $aMELO, K. E. de O.
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