Por favor, use este identificador para citar o enlazar este ítem: http://repositorio.iniap.gob.ec/handle/41000/5296
Tipo de Documento: Revista
Artículo
Autor : 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
Título : Photosynthetic response to low and high light of cacao growing without shade in an area of low evaporative demand
Otros títulos : Respuestas fotosintéticas de cacao cultivado sin sombra a alta y baja radiación en áreas de baja demanda evaporativa
Título de la serie: Acta Biológica Colombiana 23(1):95-103
Palabras clave : CACAO YIELD;CHLOROPHYLL FLUORESCENCE;CO2 ASSIMILATION RATE;GAS EXCHANGE
Fecha de publicación : 11-nov-2017
Código: *EC-INIAP-BEETP-MBY. Mocache (Acta Biológica Colombiana 23(1):95-103. 2017)
Páginas: p. 95-103
Estación: E. E. Tropical Pichilingue
Resumen : 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.
Citación : Jaimez Arellano, R.E., Amores Puyutaxi, F.M., Vasco Medina, S.A., Loor Solorzano, R.G.,Tarqui Friere, O.M., Quijano Rivadeneira, G.C., Jiménez Barragán, J.C., Tezara. W., (Noviembre, 2017). Photosynthetic response to the low and high light of cacao growing without shade in an area of low evaporative demand. Acta Biológica Colombiana 23(1):95-130.
URI : http://repositorio.iniap.gob.ec/handle/41000/5296
ISSN : 1900-1649
0120-548X
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