Acclimation of manwood seedlings to full sunlight
Autor(a) principal: | |
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Data de Publicação: | 2010 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | por |
Título da fonte: | Pesquisa Agropecuária Brasileira (Online) |
Texto Completo: | https://seer.sct.embrapa.br/index.php/pab/article/view/2064 |
Resumo: | The aim of this work was to determine the physiological changes that occur in manwood (Minquartia guianensis) during the acclimation process to high irradiance, and also to determine the acclimation strategy of this species. Plants kept in low light were transferred to high irradiance for 290 days. During this period the ratio between variable fluorescence and maximum fluorescence (Fv/Fm) was measured in leaves developed in the shade, and after premature senescence due to photooxidation, in sun-acclimated leaves. At the end of the experimental period the anatomic and photosynthetic characteristics of leaves were determined. Exposure to high irradiance caused, just after transferring, strong photoinhibition and partial photooxidation, but did not cause plant death. Leaves produced in sunny environment showed Fv/Fm similar to that of control plants. Light-saturated photosynthesis and CO2 saturated-photosynthesis were 90 and 50% higher in plants acclimated to high irradiance. The maximum carboxylation velocity of rubisco and the maximum rate of ribulose bisphosphate regeneration followed the same trend. Leaves produced under sunlight had higher stomatal density and increased leaf thickness. The production of new leaves is the main acclimation strategy to high irradiance in manwood. |
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Acclimation of manwood seedlings to full sunlightAclimatação de mudas de acariquara à alta irradiânciaMinquartia guianensis; leaf traits; photosynthetic characteristics; chlorophyll fluorescence; photoinhibitionMinquartia guianensis; características da folha; características fotossintéticas; fluorescência da clorofila; fotoinibiçãoThe aim of this work was to determine the physiological changes that occur in manwood (Minquartia guianensis) during the acclimation process to high irradiance, and also to determine the acclimation strategy of this species. Plants kept in low light were transferred to high irradiance for 290 days. During this period the ratio between variable fluorescence and maximum fluorescence (Fv/Fm) was measured in leaves developed in the shade, and after premature senescence due to photooxidation, in sun-acclimated leaves. At the end of the experimental period the anatomic and photosynthetic characteristics of leaves were determined. Exposure to high irradiance caused, just after transferring, strong photoinhibition and partial photooxidation, but did not cause plant death. Leaves produced in sunny environment showed Fv/Fm similar to that of control plants. Light-saturated photosynthesis and CO2 saturated-photosynthesis were 90 and 50% higher in plants acclimated to high irradiance. The maximum carboxylation velocity of rubisco and the maximum rate of ribulose bisphosphate regeneration followed the same trend. Leaves produced under sunlight had higher stomatal density and increased leaf thickness. The production of new leaves is the main acclimation strategy to high irradiance in manwood.O objetivo deste trabalho foi determinar as mudanças fisiológicas que ocorrem em acariquara (Minquartia guianensis) durante o processo de aclimatação à alta irradiância, bem como a estratégia de aclimatação dessa espécie. Plantas mantidas em baixa irradiância foram transferidas para alta irradiância por 290 dias. Durante esse período, foi medida a relação entre fluorescência variável e máxima (Fv/Fm), em folhas desenvolvidas à sombra e, após a senescência prematura por foto-oxidação, em folhas aclimatadas ao sol. Ao final do experimento, foram determinadas as características fotossintéticas e anatômicas da folha. A exposição à alta irradiância causou, logo após a transferência, forte fotoinibição e foto-oxidação parcial da folhagem, mas não provocou a morte da planta. Folhas produzidas no ambiente ensolarado apresentaram valores de Fv/Fm similares aos do controle. A fotossíntese saturada por luz e a fotossíntese saturada por CO2 foram 90 e 50% maiores em plantas aclimatadas à alta irradiância. A velocidade máxima de carboxilação da rubisco e a taxa máxima de regeneração da ribulose bisfosfato seguiram a mesma tendência. Folhas produzidas ao sol apresentaram maior densidade estomática e maior espessura foliar. A produção de folhas novas é a principal estratégia de aclimatação da acariquara à alta irradiância.Pesquisa Agropecuaria BrasileiraPesquisa Agropecuária BrasileiraMCT, FAPEAM, CNPqMagalhães, Nilvanda dos SantosMarenco, Ricardo AntonioMendes, Keila Rêgo2010-11-18info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://seer.sct.embrapa.br/index.php/pab/article/view/2064Pesquisa Agropecuaria Brasileira; v.44, n.7, jul. 2009; 687-694Pesquisa Agropecuária Brasileira; v.44, n.7, jul. 2009; 687-6941678-39210100-104xreponame:Pesquisa Agropecuária Brasileira (Online)instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)instacron:EMBRAPAporhttps://seer.sct.embrapa.br/index.php/pab/article/view/2064/5749https://seer.sct.embrapa.br/index.php/pab/article/downloadSuppFile/2064/1457https://seer.sct.embrapa.br/index.php/pab/article/downloadSuppFile/2064/1458https://seer.sct.embrapa.br/index.php/pab/article/downloadSuppFile/2064/1459https://seer.sct.embrapa.br/index.php/pab/article/downloadSuppFile/2064/1460https://seer.sct.embrapa.br/index.php/pab/article/downloadSuppFile/2064/1461https://seer.sct.embrapa.br/index.php/pab/article/downloadSuppFile/2064/1462https://seer.sct.embrapa.br/index.php/pab/article/downloadSuppFile/2064/1945https://seer.sct.embrapa.br/index.php/pab/article/downloadSuppFile/2064/1946https://seer.sct.embrapa.br/index.php/pab/article/downloadSuppFile/2064/1947https://seer.sct.embrapa.br/index.php/pab/article/downloadSuppFile/2064/1948https://seer.sct.embrapa.br/index.php/pab/article/downloadSuppFile/2064/1949info:eu-repo/semantics/openAccess2012-06-17T11:50:45Zoai:ojs.seer.sct.embrapa.br:article/2064Revistahttp://seer.sct.embrapa.br/index.php/pabPRIhttps://old.scielo.br/oai/scielo-oai.phppab@sct.embrapa.br || sct.pab@embrapa.br1678-39210100-204Xopendoar:2012-06-17T11:50:45Pesquisa Agropecuária Brasileira (Online) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)false |
dc.title.none.fl_str_mv |
Acclimation of manwood seedlings to full sunlight Aclimatação de mudas de acariquara à alta irradiância |
title |
Acclimation of manwood seedlings to full sunlight |
spellingShingle |
Acclimation of manwood seedlings to full sunlight Magalhães, Nilvanda dos Santos Minquartia guianensis; leaf traits; photosynthetic characteristics; chlorophyll fluorescence; photoinhibition Minquartia guianensis; características da folha; características fotossintéticas; fluorescência da clorofila; fotoinibição |
title_short |
Acclimation of manwood seedlings to full sunlight |
title_full |
Acclimation of manwood seedlings to full sunlight |
title_fullStr |
Acclimation of manwood seedlings to full sunlight |
title_full_unstemmed |
Acclimation of manwood seedlings to full sunlight |
title_sort |
Acclimation of manwood seedlings to full sunlight |
author |
Magalhães, Nilvanda dos Santos |
author_facet |
Magalhães, Nilvanda dos Santos Marenco, Ricardo Antonio Mendes, Keila Rêgo |
author_role |
author |
author2 |
Marenco, Ricardo Antonio Mendes, Keila Rêgo |
author2_role |
author author |
dc.contributor.none.fl_str_mv |
MCT, FAPEAM, CNPq |
dc.contributor.author.fl_str_mv |
Magalhães, Nilvanda dos Santos Marenco, Ricardo Antonio Mendes, Keila Rêgo |
dc.subject.por.fl_str_mv |
Minquartia guianensis; leaf traits; photosynthetic characteristics; chlorophyll fluorescence; photoinhibition Minquartia guianensis; características da folha; características fotossintéticas; fluorescência da clorofila; fotoinibição |
topic |
Minquartia guianensis; leaf traits; photosynthetic characteristics; chlorophyll fluorescence; photoinhibition Minquartia guianensis; características da folha; características fotossintéticas; fluorescência da clorofila; fotoinibição |
description |
The aim of this work was to determine the physiological changes that occur in manwood (Minquartia guianensis) during the acclimation process to high irradiance, and also to determine the acclimation strategy of this species. Plants kept in low light were transferred to high irradiance for 290 days. During this period the ratio between variable fluorescence and maximum fluorescence (Fv/Fm) was measured in leaves developed in the shade, and after premature senescence due to photooxidation, in sun-acclimated leaves. At the end of the experimental period the anatomic and photosynthetic characteristics of leaves were determined. Exposure to high irradiance caused, just after transferring, strong photoinhibition and partial photooxidation, but did not cause plant death. Leaves produced in sunny environment showed Fv/Fm similar to that of control plants. Light-saturated photosynthesis and CO2 saturated-photosynthesis were 90 and 50% higher in plants acclimated to high irradiance. The maximum carboxylation velocity of rubisco and the maximum rate of ribulose bisphosphate regeneration followed the same trend. Leaves produced under sunlight had higher stomatal density and increased leaf thickness. The production of new leaves is the main acclimation strategy to high irradiance in manwood. |
publishDate |
2010 |
dc.date.none.fl_str_mv |
2010-11-18 |
dc.type.none.fl_str_mv |
|
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
https://seer.sct.embrapa.br/index.php/pab/article/view/2064 |
url |
https://seer.sct.embrapa.br/index.php/pab/article/view/2064 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.relation.none.fl_str_mv |
https://seer.sct.embrapa.br/index.php/pab/article/view/2064/5749 https://seer.sct.embrapa.br/index.php/pab/article/downloadSuppFile/2064/1457 https://seer.sct.embrapa.br/index.php/pab/article/downloadSuppFile/2064/1458 https://seer.sct.embrapa.br/index.php/pab/article/downloadSuppFile/2064/1459 https://seer.sct.embrapa.br/index.php/pab/article/downloadSuppFile/2064/1460 https://seer.sct.embrapa.br/index.php/pab/article/downloadSuppFile/2064/1461 https://seer.sct.embrapa.br/index.php/pab/article/downloadSuppFile/2064/1462 https://seer.sct.embrapa.br/index.php/pab/article/downloadSuppFile/2064/1945 https://seer.sct.embrapa.br/index.php/pab/article/downloadSuppFile/2064/1946 https://seer.sct.embrapa.br/index.php/pab/article/downloadSuppFile/2064/1947 https://seer.sct.embrapa.br/index.php/pab/article/downloadSuppFile/2064/1948 https://seer.sct.embrapa.br/index.php/pab/article/downloadSuppFile/2064/1949 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Pesquisa Agropecuaria Brasileira Pesquisa Agropecuária Brasileira |
publisher.none.fl_str_mv |
Pesquisa Agropecuaria Brasileira Pesquisa Agropecuária Brasileira |
dc.source.none.fl_str_mv |
Pesquisa Agropecuaria Brasileira; v.44, n.7, jul. 2009; 687-694 Pesquisa Agropecuária Brasileira; v.44, n.7, jul. 2009; 687-694 1678-3921 0100-104x reponame:Pesquisa Agropecuária Brasileira (Online) instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa) instacron:EMBRAPA |
instname_str |
Empresa Brasileira de Pesquisa Agropecuária (Embrapa) |
instacron_str |
EMBRAPA |
institution |
EMBRAPA |
reponame_str |
Pesquisa Agropecuária Brasileira (Online) |
collection |
Pesquisa Agropecuária Brasileira (Online) |
repository.name.fl_str_mv |
Pesquisa Agropecuária Brasileira (Online) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa) |
repository.mail.fl_str_mv |
pab@sct.embrapa.br || sct.pab@embrapa.br |
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