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Título : Selective photobleaching of chlorophylls and carotenoids in Photosystem I particles under high-light treatment
Autor : Andreeva, Atanaska; Abarova, Silvia; Stoitchkovaa, Katerina; Picorel Castaño, Rafael ; Velitchkova, Maya Y.
Palabras clave : Carotenoid
Chlorophyll
Photobleaching
PSI-200
Photoprotection
Xanthophyll
Fecha de publicación : 6-ene-2007
Editor: Blackwell Publishing
Citación : Photochemistry and Photobiology, 2007, 83: 1301-1307
Resumen: Photosystem I particles (PSI-200) isolated from spinach leaves were studied by means of absorbance, 77K fluorescence, and resonance Raman spectroscopy. The aim was to obtain better insight into the changes of in the pigment spectral properties of pigments molecules in those Photosystem I particles during prolonged exposure to high-light intensities and to reveal the involvement of these pigments in the photoprotection of the Photosystem I. particles. During prolonged exposure to high-light intensities of spinach Photosystem I particles, a loss of a significant amount of photosynthetic pigments was observed. It was shown that various pigments exhibited different susceptibility to photodamage. effect. In addition to bleaching of chlorophyll a, bleaching of carotenoids was also clearly observed. Resonance Raman technique allowed us to recognize the type and conformation of photobleached carotenoid molecules. Raman data revealed a nearly full photobleaching of the long-wavelength lutein molecules. The observed similar bleaching rate of the lutein molecules and the most red-shifted long-wavelength chlorophyll a absorbing pigments, located in the antenna membrane protein Lcha4, suggested that these molecules are located closely. Our results showed that the photobleached antenna pigments and especially luteins and the long-wavelength absorbing chlorophylls, being dimers or pigment aggregates, are involved in photoprotection of PSI core complex.
Descripción : The definitive version is available at: www.blackwell-synergy.com
URI : http://hdl.handle.net/10261/3581
DOI: 10.1111/j.1751-1097.2007.00136.x
ISBN : 0031-8655
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