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Título: | Photobleaching of photosynthetic pigments in spinach thylakoid membranes. Effect of temperature, oxygen and DCMU |
Autor: | Velitchkova, Maya; Picorel Castaño, Rafael CSIC ORCID | Palabras clave: | Photobleaching Thylakoids Pigments Spectroscopy Environmental factors |
Fecha de publicación: | ene-2004 | Editor: | Elsevier | Citación: | Biophysical Chemistry 107 (1): 25-32 (2004) | Resumen: | The time dependence of photobleaching of photosynthetic pigments under high light illumination of isolated spinach thylakoid membranes at 22 and 4°C was investigated. At 22°C, the bleaching at 678, 472 and 436 nm was prominent but lowering the temperature up to 4°C during illumination prevented the pigments from bleaching almost completely. The accelerating effect on pigment photobleaching by the presence of 3-(3,4 dichlorophenyl)-1,1- dimethyl-urea) - (DCMU), a well-known inhibitor of the electron transport and known to prevent photosystem I (PSI) and photosystem II (PSII) against photoinhibitory damage, was also suppressed at low temperature. At 22°C in the presence and absence of DCMU, the decrease of the absorption at 678 and 472 nm was accompanied by a shift to the shorter wavelengths. To check the involvement of reactive oxygen species in the process, pigment photobleaching was followed in anaerobiosis. The effects of the three different environmental factors - light, temperature and DCMU - on the dynamics of photobleaching are discussed in terms of different susceptibility of the main pigment-protein complexes to photoinhibition. © 2003 Elsevier B.V. All rights reserved. | URI: | http://hdl.handle.net/10261/98859 | DOI: | 10.1016/S0301-4622(03)00217-5 | Identificadores: | doi: 10.1016/S0301-4622(03)00217-5 issn: 0301-4622 |
Aparece en las colecciones: | (EEAD) Artículos |
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