Photosynthetic behaviour during the leaf ontogeny of rubber tree clones[Hevea brasiliensis (Wild. ex. Adr. de Juss.) Muell. Arg.], in Lavras, MG

Detalhes bibliográficos
Autor(a) principal: Miguel, Aurélio Antas
Data de Publicação: 2007
Outros Autores: Oliveira, Luiz Edson Mota de, Cairo, Paulo Araquém Ramos, Oliveira, Davi Melo de
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UFLA
Texto Completo: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542007000100014
http://repositorio.ufla.br/jspui/handle/1/6340
Resumo: This work proposed to investigate changes in the photosynthetic behavior during the leaf ontogeny of the during the leaf development. Up to the 32nd day of leaf age (stage B2), the net photosynthesis was negative due to the inefficiency of the photosynthetic system, and this fact was justified by the following factors: low chlorophyll content, less stomatal conductance, high rubber tree clones PB 235, RRIM 600 and GT 1, in Lavras, MG. The experiment was performed in 2004, between May and July, under field conditions, at the Universidade Federal de Lavras. During the leaf ontogeny, the following characteristics were evaluated: chlorophyll content, gaseous exchanges and chlorophyll fluorescence. The clones presented similar profiles of alterations in the physiological characteristics internal CO2 levels and low chlorophyll fluorescence. From the 37th day of leaf age, net photosynthesis became positive and gradually higher, stimulated by the increases in the chlorophyll contents, photochemical efficiency of photosystem II, carboxylation efficiency, stomatal conductance, transpiration and water use efficiency. Among the clones, photosynthetic behavior was similar, reaching maximum performance on the 57th day of leaf age (stage D), when clone RRIM 600 showed the highest net photosynthesis, differing from the clones PB 235 and GT 1.
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spelling Photosynthetic behaviour during the leaf ontogeny of rubber tree clones[Hevea brasiliensis (Wild. ex. Adr. de Juss.) Muell. Arg.], in Lavras, MGComportamento fotossintético durante a ontogenia foliar de clones de seringueira, [Hevea brasiliensis (Wild. ex. Adr. de Juss.) Muell. Arg.], em Lavras, MGRubber treePhotosynthesisGaseous exchangesChlorophyll fluorescenceSeringueiraFotossínteseTrocas gasosasFluorescência da clorofilaThis work proposed to investigate changes in the photosynthetic behavior during the leaf ontogeny of the during the leaf development. Up to the 32nd day of leaf age (stage B2), the net photosynthesis was negative due to the inefficiency of the photosynthetic system, and this fact was justified by the following factors: low chlorophyll content, less stomatal conductance, high rubber tree clones PB 235, RRIM 600 and GT 1, in Lavras, MG. The experiment was performed in 2004, between May and July, under field conditions, at the Universidade Federal de Lavras. During the leaf ontogeny, the following characteristics were evaluated: chlorophyll content, gaseous exchanges and chlorophyll fluorescence. The clones presented similar profiles of alterations in the physiological characteristics internal CO2 levels and low chlorophyll fluorescence. From the 37th day of leaf age, net photosynthesis became positive and gradually higher, stimulated by the increases in the chlorophyll contents, photochemical efficiency of photosystem II, carboxylation efficiency, stomatal conductance, transpiration and water use efficiency. Among the clones, photosynthetic behavior was similar, reaching maximum performance on the 57th day of leaf age (stage D), when clone RRIM 600 showed the highest net photosynthesis, differing from the clones PB 235 and GT 1.Este trabalho, propôs-se a investigar mudanças no comportamento fotossintético durante a ontogenia foliar dos clones de seringueira PB 235, RRIM 600 e GT 1, em Lavras, MG. O experimento foi realizado no período de maio a julho de 2004, em condições de campo, na Universidade Federal de Lavras. Durante a ontogenia foliar avaliaram-se as seguintes características: os teores de clorofilas, as trocas gasosas e a fluorescência da clorofila. Os clones apresentaram perfis semelhantes de alterações nas características fisiológicas avaliadas durante o desenvolvimento foliar. Até o 32º dia de idade foliar (estádio B2), a fotossíntese líquida foi negativa, devido à ineficiência do sistema fotossintético, sendo esta justificada pelos seguintes fatores: reduzidos teores de clorofilas, menor condutância estomática, alta concentração interna de CO2 e baixa fluorescência de clorofilas. A partir do 37º dia de idade foliar, a fotossíntese líquida tornou-se positiva e gradativamente maior, estimulada por aumentos nos teores de clorofilas, eficiência fotoquímica do fotossistema II, eficiência de carboxilação, condutância estomática, transpiração e eficiência no uso da água. Entre os clones, o comportamento fotossintético foi semelhante, atingindo desempenho máximo no 57º dia de idade foliar (estádio D), quando o clone RRIM 600 apresentou a maior taxa de fotossíntese líquida diferenciando-se significativamente dos clones PB 235 e GT 1.Editora da Universidade Federal de Lavras2007-02-012015-04-30T13:34:01Z2015-04-30T13:34:01Z2015-04-30info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articletext/htmlhttp://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542007000100014MIGUEL, A. A. et al. Photosynthetic behaviour during the leaf ontogeny of rubber tree clones[Hevea brasiliensis (Wild. ex. Adr. de Juss.) Muell. Arg.], in Lavras, MG. Ciência e Agrotecnologia, Lavras, v. 31, n. 1, p. 91-97, jan./fev. 2007.http://repositorio.ufla.br/jspui/handle/1/6340Ciência e Agrotecnologia v.31 n.1 2007reponame:Repositório Institucional da UFLAinstname:Universidade Federal de Lavras (UFLA)instacron:UFLAMiguel, Aurélio AntasOliveira, Luiz Edson Mota deCairo, Paulo Araquém RamosOliveira, Davi Melo deenginfo:eu-repo/semantics/openAccess2016-08-02T11:43:16Zoai:localhost:1/6340Repositório InstitucionalPUBhttp://repositorio.ufla.br/oai/requestnivaldo@ufla.br || repositorio.biblioteca@ufla.bropendoar:2016-08-02T11:43:16Repositório Institucional da UFLA - Universidade Federal de Lavras (UFLA)false
dc.title.none.fl_str_mv Photosynthetic behaviour during the leaf ontogeny of rubber tree clones[Hevea brasiliensis (Wild. ex. Adr. de Juss.) Muell. Arg.], in Lavras, MG
Comportamento fotossintético durante a ontogenia foliar de clones de seringueira, [Hevea brasiliensis (Wild. ex. Adr. de Juss.) Muell. Arg.], em Lavras, MG
title Photosynthetic behaviour during the leaf ontogeny of rubber tree clones[Hevea brasiliensis (Wild. ex. Adr. de Juss.) Muell. Arg.], in Lavras, MG
spellingShingle Photosynthetic behaviour during the leaf ontogeny of rubber tree clones[Hevea brasiliensis (Wild. ex. Adr. de Juss.) Muell. Arg.], in Lavras, MG
Miguel, Aurélio Antas
Rubber tree
Photosynthesis
Gaseous exchanges
Chlorophyll fluorescence
Seringueira
Fotossíntese
Trocas gasosas
Fluorescência da clorofila
title_short Photosynthetic behaviour during the leaf ontogeny of rubber tree clones[Hevea brasiliensis (Wild. ex. Adr. de Juss.) Muell. Arg.], in Lavras, MG
title_full Photosynthetic behaviour during the leaf ontogeny of rubber tree clones[Hevea brasiliensis (Wild. ex. Adr. de Juss.) Muell. Arg.], in Lavras, MG
title_fullStr Photosynthetic behaviour during the leaf ontogeny of rubber tree clones[Hevea brasiliensis (Wild. ex. Adr. de Juss.) Muell. Arg.], in Lavras, MG
title_full_unstemmed Photosynthetic behaviour during the leaf ontogeny of rubber tree clones[Hevea brasiliensis (Wild. ex. Adr. de Juss.) Muell. Arg.], in Lavras, MG
title_sort Photosynthetic behaviour during the leaf ontogeny of rubber tree clones[Hevea brasiliensis (Wild. ex. Adr. de Juss.) Muell. Arg.], in Lavras, MG
author Miguel, Aurélio Antas
author_facet Miguel, Aurélio Antas
Oliveira, Luiz Edson Mota de
Cairo, Paulo Araquém Ramos
Oliveira, Davi Melo de
author_role author
author2 Oliveira, Luiz Edson Mota de
Cairo, Paulo Araquém Ramos
Oliveira, Davi Melo de
author2_role author
author
author
dc.contributor.author.fl_str_mv Miguel, Aurélio Antas
Oliveira, Luiz Edson Mota de
Cairo, Paulo Araquém Ramos
Oliveira, Davi Melo de
dc.subject.por.fl_str_mv Rubber tree
Photosynthesis
Gaseous exchanges
Chlorophyll fluorescence
Seringueira
Fotossíntese
Trocas gasosas
Fluorescência da clorofila
topic Rubber tree
Photosynthesis
Gaseous exchanges
Chlorophyll fluorescence
Seringueira
Fotossíntese
Trocas gasosas
Fluorescência da clorofila
description This work proposed to investigate changes in the photosynthetic behavior during the leaf ontogeny of the during the leaf development. Up to the 32nd day of leaf age (stage B2), the net photosynthesis was negative due to the inefficiency of the photosynthetic system, and this fact was justified by the following factors: low chlorophyll content, less stomatal conductance, high rubber tree clones PB 235, RRIM 600 and GT 1, in Lavras, MG. The experiment was performed in 2004, between May and July, under field conditions, at the Universidade Federal de Lavras. During the leaf ontogeny, the following characteristics were evaluated: chlorophyll content, gaseous exchanges and chlorophyll fluorescence. The clones presented similar profiles of alterations in the physiological characteristics internal CO2 levels and low chlorophyll fluorescence. From the 37th day of leaf age, net photosynthesis became positive and gradually higher, stimulated by the increases in the chlorophyll contents, photochemical efficiency of photosystem II, carboxylation efficiency, stomatal conductance, transpiration and water use efficiency. Among the clones, photosynthetic behavior was similar, reaching maximum performance on the 57th day of leaf age (stage D), when clone RRIM 600 showed the highest net photosynthesis, differing from the clones PB 235 and GT 1.
publishDate 2007
dc.date.none.fl_str_mv 2007-02-01
2015-04-30T13:34:01Z
2015-04-30T13:34:01Z
2015-04-30
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542007000100014
MIGUEL, A. A. et al. Photosynthetic behaviour during the leaf ontogeny of rubber tree clones[Hevea brasiliensis (Wild. ex. Adr. de Juss.) Muell. Arg.], in Lavras, MG. Ciência e Agrotecnologia, Lavras, v. 31, n. 1, p. 91-97, jan./fev. 2007.
http://repositorio.ufla.br/jspui/handle/1/6340
url http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542007000100014
http://repositorio.ufla.br/jspui/handle/1/6340
identifier_str_mv MIGUEL, A. A. et al. Photosynthetic behaviour during the leaf ontogeny of rubber tree clones[Hevea brasiliensis (Wild. ex. Adr. de Juss.) Muell. Arg.], in Lavras, MG. Ciência e Agrotecnologia, Lavras, v. 31, n. 1, p. 91-97, jan./fev. 2007.
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv text/html
dc.publisher.none.fl_str_mv Editora da Universidade Federal de Lavras
publisher.none.fl_str_mv Editora da Universidade Federal de Lavras
dc.source.none.fl_str_mv Ciência e Agrotecnologia v.31 n.1 2007
reponame:Repositório Institucional da UFLA
instname:Universidade Federal de Lavras (UFLA)
instacron:UFLA
instname_str Universidade Federal de Lavras (UFLA)
instacron_str UFLA
institution UFLA
reponame_str Repositório Institucional da UFLA
collection Repositório Institucional da UFLA
repository.name.fl_str_mv Repositório Institucional da UFLA - Universidade Federal de Lavras (UFLA)
repository.mail.fl_str_mv nivaldo@ufla.br || repositorio.biblioteca@ufla.br
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