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 mo...

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Main Authors: Jaimez Arellano, Ramón Eduardo, Amores Puyutaxi, Freddy Marcelo, Vasco Medina, Segundo Alfonso, Loor Solórzano, Rey Gastón, Tarqui Freire, Omar Miguel, Quijano Rivadeneira, Grisnel Carmelo, Jiménez Barragán, Juan Carlos, Tezara, Wilmer
Format: Artículos
Language:en
Published: 2019
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Online Access:http://repositorio.iniap.gob.ec/handle/41000/5296
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spelling ir-:41000-52962019-02-28T14:17:23Z Photosynthetic response to low and high light of cacao growing without shade in an area of low evaporative demand Respuestas fotosintéticas de cacao cultivado sin sombra a alta y baja radiación en áreas de baja demanda evaporativa Acta Biológica Colombiana 23(1):95-103 Jaimez Arellano, Ramón Eduardo Amores Puyutaxi, Freddy Marcelo Vasco Medina, Segundo Alfonso Loor Solórzano, Rey Gastón Tarqui Freire, Omar Miguel Quijano Rivadeneira, Grisnel Carmelo Jiménez Barragán, Juan Carlos Tezara, Wilmer CACAO YIELD CHLOROPHYLL FLUORESCENCE CO2 ASSIMILATION RATE GAS EXCHANGE 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 were evaluated: eight clones of Nacional type and two commercial clones (CCN 51 and EET 130), 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 umol m-2 s-1) to high values (100 umol m-2 s-1). Such light ressponsiveness in A has not bee 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 not-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. 2019-02-28T14:10:12Z 2019-02-28T14:10:12Z 2017-11-11 Revista Artículo 1900-1649 0120-548X *EC-INIAP-BEETP-MBY. Mocache (Acta Biológica Colombiana 23(1):95-103. 2017) http://repositorio.iniap.gob.ec/handle/41000/5296 en p. 95-103 application/pdf E. E. Tropical Pichilingue
institution INIAP
collection Repositorio INIAP
biblioteca Biblioteca INIAP
language en
format Artículos
topic CACAO YIELD
CHLOROPHYLL FLUORESCENCE
CO2 ASSIMILATION RATE
GAS EXCHANGE
spellingShingle CACAO YIELD
CHLOROPHYLL FLUORESCENCE
CO2 ASSIMILATION RATE
GAS EXCHANGE
Jaimez Arellano, Ramón Eduardo
Amores Puyutaxi, Freddy Marcelo
Vasco Medina, Segundo Alfonso
Loor Solórzano, Rey Gastón
Tarqui Freire, Omar Miguel
Quijano Rivadeneira, Grisnel Carmelo
Jiménez Barragán, Juan Carlos
Tezara, Wilmer
Photosynthetic response to low and high light of cacao growing without shade in an area of low evaporative demand
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 were evaluated: eight clones of Nacional type and two commercial clones (CCN 51 and EET 130), 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 umol m-2 s-1) to high values (100 umol m-2 s-1). Such light ressponsiveness in A has not bee 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 not-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.
author Jaimez Arellano, Ramón Eduardo
Amores Puyutaxi, Freddy Marcelo
Vasco Medina, Segundo Alfonso
Loor Solórzano, Rey Gastón
Tarqui Freire, Omar Miguel
Quijano Rivadeneira, Grisnel Carmelo
Jiménez Barragán, Juan Carlos
Tezara, Wilmer
author_facet Jaimez Arellano, Ramón Eduardo
Amores Puyutaxi, Freddy Marcelo
Vasco Medina, Segundo Alfonso
Loor Solórzano, Rey Gastón
Tarqui Freire, Omar Miguel
Quijano Rivadeneira, Grisnel Carmelo
Jiménez Barragán, Juan Carlos
Tezara, Wilmer
author_sort Jaimez Arellano, Ramón Eduardo
title Photosynthetic response to low and high light of cacao growing without shade in an area of low evaporative demand
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
publishDate 2019
url http://repositorio.iniap.gob.ec/handle/41000/5296
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score 11,871979