English   español  
Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/128762
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:

Light acclimation and pH perturbations affect photosynthetic performance in Chlorella mass culture

AutorIhnken, Sven; Navarro, Enrique
Palabras claveChlorella
Mass culture
pH perturbance
Chlorophyll fluorescence
Oxygen production
pH drift
Fecha de publicación20-nov-2014
EditorInter Research
CitaciónAquatic Biology 22: 95-110 (2014)
ResumenChlorella spp. are robust chlorophyte microalgal species frequently used in mass culture. The pH optimum for growth is close to neutrality; at this pH, theoretically little energy is required to maintain homeostasis. In the present study, we grew Chlorella fusca cells in an open, outdoor, thin-layer cascade photobioreactor (TLC), under ambient photon flux at the theoretically preferred pH (7.2), and let the culture pass the exponential growth phase. Using pH drift experiments, we show that an alkalization to pH 9 supported photosynthesis in the TLC. The increased photosynthetic activity under alkaline conditions was a pH-dependent effect, and not a dissolved inorganic carbon (DIC) concentration- or light intensity-dependent effect. Re-acidification (in one step or in increments) lowered gross oxygen production and increased non-photochemical quenching in short-term experiments. Gross oxygen production and electron transport rates in PSII were uncoupled during the pH perturbation experiments. Electron transport rates were only marginally affected by pH, whereas oxygen production rates decreased with acidification. Alternative electron pathways, electron donation at the plastid terminal oxidase and state-transitions are discussed as a potential explanation. Because cell material from the TLC was not operating at maximal capacity, we propose that alkalization can support photosynthesis in challenged TLC systems.
Descripción16 páginas.- Sven Ihnken... et al.
Versión del editorhttp://dx.doi.org/10.1016/j.palaeo.2015.06.030
Aparece en las colecciones: (IPE) Artículos
Ficheros en este ítem:
Fichero Descripción Tamaño Formato  
Ihnken_etal_Light_pH2015.pdf956,31 kBAdobe PDFVista previa
Mostrar el registro completo

Artículos relacionados:

NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.