Photosynthetic limitations in coffee plants are chiefly governed by diffusive factors

It has long been held that the regulation of photosynthesis in source leaves may be controlled by carbohydrates. The mechanisms that govern the diurnal fluctuation of photosynthesis and the potential role of feedback regulation by carbohydrates during photosynthesis in coffee (Coffea arabica) leaves...

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Detalles Bibliográficos
Autores: Batista, Karine D., Araújo, Wagner L., Antunes, Werner C., Cavatte, Paulo C., Moraes, Gustavo A. B. K., Martins, Samuel C. V., DaMatta, Fábio M.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2012
País:Brasil
Institución:Universidade Federal de Viçosa (UFV)
Repositorio:LOCUS Repositório Institucional da UFV
Idioma:inglés
OAI Identifier:oai:locus.ufv.br:123456789/22252
Acceso en línea:https://doi.org/10.1007/s00468-011-0606-2
http://www.locus.ufv.br/handle/123456789/22252
Access Level:acceso abierto
Palabra clave:Carbohydrates
Coffea arabica
Photosynthesis down-regulation
Photoinhibition
Stomatal conductance
Vapour pressure deficit
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spelling Photosynthetic limitations in coffee plants are chiefly governed by diffusive factorsCarbohydratesCoffea arabicaPhotosynthesis down-regulationPhotoinhibitionStomatal conductanceVapour pressure deficitIt has long been held that the regulation of photosynthesis in source leaves may be controlled by carbohydrates. The mechanisms that govern the diurnal fluctuation of photosynthesis and the potential role of feedback regulation by carbohydrates during photosynthesis in coffee (Coffea arabica) leaves were investigated in three independent and complementary experiments. An integrative approach using gas exchange measurements in addition to carbon isotope labelling and steady-state carbohydrate and amino acid analysis was performed. Canonical correlation analysis was also performed. In field-grown plants under naturally fluctuating environmental conditions (Experiment I), the overall pattern of gas exchange was characterised by both low stomatal conductance (g s) and net carbon assimilation rate (A) in the afternoon; no apparent signs of photoinhibition were observed. Under conditions of low air evaporative demand (Experiment II), only slight decreases (~20%) in A were observed at the end of the day, which were associated with a reduction (~35%) in g s. For both conditions, any increase in carbohydrate and amino acid pools over the course of the day was small. In leaves from girdled branches (Experiment III), a remarkable decrease in A and particularly in g s was observed, as were increases in starch but not in hexoses and sucrose pools. Furthermore, the rate of 14CO2 uptake (assessed under saturating CO2 conditions) and the partitioning of recently fixed 14C were not affected by girdling. It is proposed that the diurnal oscillations in A and the differences in A in leaves from girdled and non-girdled branches were merely a consequence of diffusive limitations rather than from photochemical constraints or direct metabolite-mediated down-regulation of photosynthesis.Trees2018-10-10T19:32:15Z2018-10-10T19:32:15Z2012-04info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlepdfapplication/pdf1432-2285https://doi.org/10.1007/s00468-011-0606-2http://www.locus.ufv.br/handle/123456789/22252engVolume 26, Issue 2, p. 459–468, April 2012Springer-Verlaginfo:eu-repo/semantics/openAccessreponame:LOCUS Repositório Institucional da UFVinstname:Universidade Federal de Viçosa (UFV)instacron:UFVBatista, Karine D.Araújo, Wagner L.Antunes, Werner C.Cavatte, Paulo C.Moraes, Gustavo A. B. K.Martins, Samuel C. V.DaMatta, Fábio M.2024-07-12T07:05:39Zoai:locus.ufv.br:123456789/22252Repositório InstitucionalPUBhttps://www.locus.ufv.br/oai/requestfabiojreis@ufv.bropendoar:21452024-07-12T07:05:39LOCUS Repositório Institucional da UFV - Universidade Federal de Viçosa (UFV)false
dc.title.none.fl_str_mv Photosynthetic limitations in coffee plants are chiefly governed by diffusive factors
title Photosynthetic limitations in coffee plants are chiefly governed by diffusive factors
spellingShingle Photosynthetic limitations in coffee plants are chiefly governed by diffusive factors
Batista, Karine D.
Carbohydrates
Coffea arabica
Photosynthesis down-regulation
Photoinhibition
Stomatal conductance
Vapour pressure deficit
title_short Photosynthetic limitations in coffee plants are chiefly governed by diffusive factors
title_full Photosynthetic limitations in coffee plants are chiefly governed by diffusive factors
title_fullStr Photosynthetic limitations in coffee plants are chiefly governed by diffusive factors
title_full_unstemmed Photosynthetic limitations in coffee plants are chiefly governed by diffusive factors
title_sort Photosynthetic limitations in coffee plants are chiefly governed by diffusive factors
dc.creator.none.fl_str_mv Batista, Karine D.
Araújo, Wagner L.
Antunes, Werner C.
Cavatte, Paulo C.
Moraes, Gustavo A. B. K.
Martins, Samuel C. V.
DaMatta, Fábio M.
author Batista, Karine D.
author_facet Batista, Karine D.
Araújo, Wagner L.
Antunes, Werner C.
Cavatte, Paulo C.
Moraes, Gustavo A. B. K.
Martins, Samuel C. V.
DaMatta, Fábio M.
author_role author
author2 Araújo, Wagner L.
Antunes, Werner C.
Cavatte, Paulo C.
Moraes, Gustavo A. B. K.
Martins, Samuel C. V.
DaMatta, Fábio M.
author2_role author
author
author
author
author
author
dc.subject.por.fl_str_mv Carbohydrates
Coffea arabica
Photosynthesis down-regulation
Photoinhibition
Stomatal conductance
Vapour pressure deficit
topic Carbohydrates
Coffea arabica
Photosynthesis down-regulation
Photoinhibition
Stomatal conductance
Vapour pressure deficit
description It has long been held that the regulation of photosynthesis in source leaves may be controlled by carbohydrates. The mechanisms that govern the diurnal fluctuation of photosynthesis and the potential role of feedback regulation by carbohydrates during photosynthesis in coffee (Coffea arabica) leaves were investigated in three independent and complementary experiments. An integrative approach using gas exchange measurements in addition to carbon isotope labelling and steady-state carbohydrate and amino acid analysis was performed. Canonical correlation analysis was also performed. In field-grown plants under naturally fluctuating environmental conditions (Experiment I), the overall pattern of gas exchange was characterised by both low stomatal conductance (g s) and net carbon assimilation rate (A) in the afternoon; no apparent signs of photoinhibition were observed. Under conditions of low air evaporative demand (Experiment II), only slight decreases (~20%) in A were observed at the end of the day, which were associated with a reduction (~35%) in g s. For both conditions, any increase in carbohydrate and amino acid pools over the course of the day was small. In leaves from girdled branches (Experiment III), a remarkable decrease in A and particularly in g s was observed, as were increases in starch but not in hexoses and sucrose pools. Furthermore, the rate of 14CO2 uptake (assessed under saturating CO2 conditions) and the partitioning of recently fixed 14C were not affected by girdling. It is proposed that the diurnal oscillations in A and the differences in A in leaves from girdled and non-girdled branches were merely a consequence of diffusive limitations rather than from photochemical constraints or direct metabolite-mediated down-regulation of photosynthesis.
publishDate 2012
dc.date.none.fl_str_mv 2012-04
2018-10-10T19:32:15Z
2018-10-10T19:32:15Z
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 1432-2285
https://doi.org/10.1007/s00468-011-0606-2
http://www.locus.ufv.br/handle/123456789/22252
identifier_str_mv 1432-2285
url https://doi.org/10.1007/s00468-011-0606-2
http://www.locus.ufv.br/handle/123456789/22252
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Volume 26, Issue 2, p. 459–468, April 2012
dc.rights.driver.fl_str_mv Springer-Verlag
info:eu-repo/semantics/openAccess
rights_invalid_str_mv Springer-Verlag
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv pdf
application/pdf
dc.publisher.none.fl_str_mv Trees
publisher.none.fl_str_mv Trees
dc.source.none.fl_str_mv reponame:LOCUS Repositório Institucional da UFV
instname:Universidade Federal de Viçosa (UFV)
instacron:UFV
instname_str Universidade Federal de Viçosa (UFV)
instacron_str UFV
institution UFV
reponame_str LOCUS Repositório Institucional da UFV
collection LOCUS Repositório Institucional da UFV
repository.name.fl_str_mv LOCUS Repositório Institucional da UFV - Universidade Federal de Viçosa (UFV)
repository.mail.fl_str_mv fabiojreis@ufv.br
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score 15.300719

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