Photosynthetic response to low and high light of cacao growing without shade in an area of low evaporative demand

Cacao (Theobroma cacao L.) breeding programmes in Ecuador have focused on obtaining high-yield clones with improved disease resistance. Cacao clones should also have photosynthetic characteristics which support increased productivity. Regarding the weather conditions at the coast of Ecuador, where m...

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Autores:
Jaimez, Ramon Eduardo
Amores Puyutaxi, Freddy
Vasco, Alfonso
Loor, Rey Gastón
Tarqui, Omar
Quijano, Grisnel
Jimenez, Juan Carlos
Tezara, Wilmer
Tipo de recurso:
Article of journal
Fecha de publicación:
2018
Institución:
Universidad Nacional de Colombia
Repositorio:
Universidad Nacional de Colombia
Idioma:
spa
OAI Identifier:
oai:repositorio.unal.edu.co:unal/68163
Acceso en línea:
https://repositorio.unal.edu.co/handle/unal/68163
http://bdigital.unal.edu.co/69196/
Palabra clave:
57 Ciencias de la vida; Biología / Life sciences; biology
cacao yield
chlorophyll fluorescence
CO2 assimilation rate
gas exchange.
Fluorescencia clorofila
intercambio gases
producción de cacao
tasa de asimilación de CO2.
Rights
openAccess
License
Atribución-NoComercial 4.0 Internacional
id UNACIONAL2_d9409bcfdf3ed2bd314eb802d6e0e128
oai_identifier_str oai:repositorio.unal.edu.co:unal/68163
network_acronym_str UNACIONAL2
network_name_str Universidad Nacional de Colombia
repository_id_str
dc.title.spa.fl_str_mv Photosynthetic response to low and high light of cacao growing without shade in an area of low evaporative demand
title Photosynthetic response to low and high light of cacao growing without shade in an area of low evaporative demand
spellingShingle Photosynthetic response to low and high light of cacao growing without shade in an area of low evaporative demand
57 Ciencias de la vida; Biología / Life sciences; biology
cacao yield
chlorophyll fluorescence
CO2 assimilation rate
gas exchange.
Fluorescencia clorofila
intercambio gases
producción de cacao
tasa de asimilación de CO2.
title_short Photosynthetic response to low and high light of cacao growing without shade in an area of low evaporative demand
title_full Photosynthetic response to low and high light of cacao growing without shade in an area of low evaporative demand
title_fullStr Photosynthetic response to low and high light of cacao growing without shade in an area of low evaporative demand
title_full_unstemmed Photosynthetic response to low and high light of cacao growing without shade in an area of low evaporative demand
title_sort Photosynthetic response to low and high light of cacao growing without shade in an area of low evaporative demand
dc.creator.fl_str_mv Jaimez, Ramon Eduardo
Amores Puyutaxi, Freddy
Vasco, Alfonso
Loor, Rey Gastón
Tarqui, Omar
Quijano, Grisnel
Jimenez, Juan Carlos
Tezara, Wilmer
dc.contributor.author.spa.fl_str_mv Jaimez, Ramon Eduardo
Amores Puyutaxi, Freddy
Vasco, Alfonso
Loor, Rey Gastón
Tarqui, Omar
Quijano, Grisnel
Jimenez, Juan Carlos
Tezara, Wilmer
dc.subject.ddc.spa.fl_str_mv 57 Ciencias de la vida; Biología / Life sciences; biology
topic 57 Ciencias de la vida; Biología / Life sciences; biology
cacao yield
chlorophyll fluorescence
CO2 assimilation rate
gas exchange.
Fluorescencia clorofila
intercambio gases
producción de cacao
tasa de asimilación de CO2.
dc.subject.proposal.spa.fl_str_mv cacao yield
chlorophyll fluorescence
CO2 assimilation rate
gas exchange.
Fluorescencia clorofila
intercambio gases
producción de cacao
tasa de asimilación de CO2.
description Cacao (Theobroma cacao L.) breeding programmes in Ecuador have focused on obtaining high-yield clones with improved disease resistance. Cacao clones should also have photosynthetic characteristics which support increased productivity. Regarding the weather conditions at the coast of Ecuador, where most of the year there are overcasts and low air evaporative demand, there is the possibility to grow cacao without overhead shade. This study focused on the photosynthetic response at two different photosynthetic photon flux densities (PPFD) of Ecuadorian cacao clones. Seven-year old cacao clones were evaluated: eight clones of Nacional type and two commercial clones (CCN 51 and EET 103), used as controls. All clones showed an increase of 35 % on average in net photosynthetic rate (A)with increasing PPFD from the light saturation point for cacao (i.e. 400 µmol m-2 s-1) to high values (1000 µmol m-2 s-1). Such light responsiveness in A has not been reported before. Higher A was associated with higher apparent electron transport rate, while high stomatal conductance was maintained under both PPFD conditions. Under high PPFD, low non-photochemical quenching values were found, suggesting low energy dissipation. All clones showed high maximum quantum yields of PSII (Fv/Fm), suggesting the absence of damage of the photochemical system.
publishDate 2018
dc.date.issued.spa.fl_str_mv 2018-01-01
dc.date.accessioned.spa.fl_str_mv 2019-07-03T06:01:40Z
dc.date.available.spa.fl_str_mv 2019-07-03T06:01:40Z
dc.type.spa.fl_str_mv Artículo de revista
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dc.type.driver.spa.fl_str_mv info:eu-repo/semantics/article
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dc.identifier.issn.spa.fl_str_mv ISSN: 1900-1649
dc.identifier.uri.none.fl_str_mv https://repositorio.unal.edu.co/handle/unal/68163
dc.identifier.eprints.spa.fl_str_mv http://bdigital.unal.edu.co/69196/
identifier_str_mv ISSN: 1900-1649
url https://repositorio.unal.edu.co/handle/unal/68163
http://bdigital.unal.edu.co/69196/
dc.language.iso.spa.fl_str_mv spa
language spa
dc.relation.spa.fl_str_mv https://revistas.unal.edu.co/index.php/actabiol/article/view/64962
dc.relation.ispartof.spa.fl_str_mv Universidad Nacional de Colombia Revistas electrónicas UN Acta Biológica Colombiana
Acta Biológica Colombiana
dc.relation.references.spa.fl_str_mv Jaimez, Ramon Eduardo and Amores Puyutaxi, Freddy and Vasco, Alfonso and Loor, Rey Gastón and Tarqui, Omar and Quijano, Grisnel and Jimenez, Juan Carlos and Tezara, Wilmer (2018) Photosynthetic response to low and high light of cacao growing without shade in an area of low evaporative demand. Acta Biológica Colombiana, 23 (1). pp. 95-103. ISSN 1900-1649
dc.rights.spa.fl_str_mv Derechos reservados - Universidad Nacional de Colombia
dc.rights.coar.fl_str_mv http://purl.org/coar/access_right/c_abf2
dc.rights.license.spa.fl_str_mv Atribución-NoComercial 4.0 Internacional
dc.rights.uri.spa.fl_str_mv http://creativecommons.org/licenses/by-nc/4.0/
dc.rights.accessrights.spa.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv Atribución-NoComercial 4.0 Internacional
Derechos reservados - Universidad Nacional de Colombia
http://creativecommons.org/licenses/by-nc/4.0/
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eu_rights_str_mv openAccess
dc.format.mimetype.spa.fl_str_mv application/pdf
dc.publisher.spa.fl_str_mv Universidad Nacional de Colombia - Sede Bogotá - Faculdad de Ciencias - Departamento de Biología
institution Universidad Nacional de Colombia
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spelling Atribución-NoComercial 4.0 InternacionalDerechos reservados - Universidad Nacional de Colombiahttp://creativecommons.org/licenses/by-nc/4.0/info:eu-repo/semantics/openAccesshttp://purl.org/coar/access_right/c_abf2Jaimez, Ramon Eduardo9acfd62a-f99a-446e-9fd0-b5ed58b45b74300Amores Puyutaxi, Freddydf873999-ace5-4ad7-9964-094b5b3e4c5c300Vasco, Alfonsob5b3453b-8094-423f-92af-5bd2e207ce8d300Loor, Rey Gastónffb67560-2077-4cf5-b4d1-f05fe421daa0300Tarqui, Omar31a29617-73d5-41cb-a557-c7b73280940e300Quijano, Grisnel990331d2-451a-461a-afd8-2e6587c5bf54300Jimenez, Juan Carlosd53a257c-b3ae-4929-9593-a3bcf67e4e75300Tezara, Wilmerbb06a81d-6f47-4eac-a55e-3aa0e7510ff43002019-07-03T06:01:40Z2019-07-03T06:01:40Z2018-01-01ISSN: 1900-1649https://repositorio.unal.edu.co/handle/unal/68163http://bdigital.unal.edu.co/69196/Cacao (Theobroma cacao L.) breeding programmes in Ecuador have focused on obtaining high-yield clones with improved disease resistance. Cacao clones should also have photosynthetic characteristics which support increased productivity. Regarding the weather conditions at the coast of Ecuador, where most of the year there are overcasts and low air evaporative demand, there is the possibility to grow cacao without overhead shade. This study focused on the photosynthetic response at two different photosynthetic photon flux densities (PPFD) of Ecuadorian cacao clones. Seven-year old cacao clones were evaluated: eight clones of Nacional type and two commercial clones (CCN 51 and EET 103), used as controls. All clones showed an increase of 35 % on average in net photosynthetic rate (A)with increasing PPFD from the light saturation point for cacao (i.e. 400 µmol m-2 s-1) to high values (1000 µmol m-2 s-1). Such light responsiveness in A has not been reported before. Higher A was associated with higher apparent electron transport rate, while high stomatal conductance was maintained under both PPFD conditions. Under high PPFD, low non-photochemical quenching values were found, suggesting low energy dissipation. All clones showed high maximum quantum yields of PSII (Fv/Fm), suggesting the absence of damage of the photochemical system.Los programas de mejoramiento de cacao (Theobroma cacao L.) en Ecuador se han centrado en la obtención de clones de alto rendimiento con mayor resistencia a las enfermedades. Estos clones  también deben tener características fotosintéticas que apoyen una mayor productividad. En las condiciones climáticas en la costa de Ecuador, donde la mayor parte del año hay alta densidad de nubes y baja demanda evaporativa, existe la posibilidad de cultivar cacao sin sombra. Este estudio se centró en la respuesta fotosintética de  clones de cacao del Ecuador en dos diferentes densidades de flujo de fotones fotosintéticos (PPFD). Se evaluaron diez clones de cacao de siete años de edad: ocho clones de tipo Nacional recientemente desarrollados por el Instituto Nacional de investigaciones Agropecuarias, y dos clones comerciales utilizados como controles (CCN 51 y EET 103). Todos los clones de cacao mostraron un aumento del 35 % en promedio en la tasa fotosintética neta (A) con el incremento del PPFD desde el punto de saturación de luz para el cacao (400 μmol m -2 s -1) hasta valores altos (1000 μmol m -2 s- 1). Dicha respuesta de A a estas condiciones de luz alta  no se  ha reportado en  cacao. La tasa fotosintética neta se asoció con una mayor velocidad aparente de transporte de electrones (J), mientras que la alta conductancia estomática (gs) se mantuvo en ambas condiciones de PPFD. En condiciones de alto PPFD, se encontraron bajos valores del coeficiente de extinción no fotoquímico (NPQ), lo que sugiere una baja disipación de energía, además de presentarse altos rendimientos cuánticos máximos de PSII (Fv / Fm), indicando la  ausencia de daño del sistema fotoquímico.application/pdfspaUniversidad Nacional de Colombia - Sede Bogotá - Faculdad de Ciencias - Departamento de Biologíahttps://revistas.unal.edu.co/index.php/actabiol/article/view/64962Universidad Nacional de Colombia Revistas electrónicas UN Acta Biológica ColombianaActa Biológica ColombianaJaimez, Ramon Eduardo and Amores Puyutaxi, Freddy and Vasco, Alfonso and Loor, Rey Gastón and Tarqui, Omar and Quijano, Grisnel and Jimenez, Juan Carlos and Tezara, Wilmer (2018) Photosynthetic response to low and high light of cacao growing without shade in an area of low evaporative demand. Acta Biológica Colombiana, 23 (1). pp. 95-103. ISSN 1900-164957 Ciencias de la vida; Biología / Life sciences; biologycacao yieldchlorophyll fluorescenceCO2 assimilation rategas exchange.Fluorescencia clorofilaintercambio gasesproducción de cacaotasa de asimilación de CO2.Photosynthetic response to low and high light of cacao growing without shade in an area of low evaporative demandArtículo de revistainfo:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501http://purl.org/coar/resource_type/c_2df8fbb1http://purl.org/coar/version/c_970fb48d4fbd8a85Texthttp://purl.org/redcol/resource_type/ARTORIGINAL64962-365640-2-PB.pdfapplication/pdf370819https://repositorio.unal.edu.co/bitstream/unal/68163/1/64962-365640-2-PB.pdfaca253eb42ed8ca89c3cac5b497a4c2eMD51THUMBNAIL64962-365640-2-PB.pdf.jpg64962-365640-2-PB.pdf.jpgGenerated Thumbnailimage/jpeg9944https://repositorio.unal.edu.co/bitstream/unal/68163/2/64962-365640-2-PB.pdf.jpg436aa7959b6a7d8d53eeae86f9748529MD52unal/68163oai:repositorio.unal.edu.co:unal/681632024-05-25 23:09:20.093Repositorio Institucional Universidad Nacional de Colombiarepositorio_nal@unal.edu.co