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'Photoinhibition' in keywords Facet   Publication Year 2001  [X]
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1Author    Maya Velitchkova, A. Ntoaneta Popova, Tzvetelina MarkovaRequires cookie*
 Title    Effect of Membrane Fluidity on Photoinhibition of Isolated Thylakoids Membranes at Room and Low Temperature  
 Abstract    The relationship betw een thylakoid membrane fluidity and the process of photoinhibition at room and low (4 °C) temperature was investigated. Two different membrane perturbing agents -cholesterol and benzylalcohol were applied to manipulate the fluidity of isolated pea thylakoids. The photochemical activity of photosystem I (PSI) and photosystem II (PSII), polarographically determ ined, were measured at high light intensity for different time of illumination at both temperatures. The exposure of cholesterol-and benzylalcohol-treated thylakoid membranes to high light intensities resulted in inhibition of both studied photo­ chemical activities, being more pronounced for PSII compared to PSI. Time dependencies of inhibition o f PSI and PSII electron transport rates for untreated and membranes with altered fluidity were determ ined at 20 °C and 4 °C. The effect is more pronounced for PSII activity during low-temperature photoinhibition. The data are discussed in terms of the determining role of physico-chemical properties of thylakoid membranes for the response o f photosyn­ thetic apparatus to light stress. 
  Reference    Z. Naturforsch. 56c, 369—3 (2001); received January 3/February 1 2001 
  Published    2001 
  Keywords    Membrane Fluidity, Photoinhibition, Thylakoid Membranes 
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 TEI-XML for    default:Reihe_C/56/ZNC-2001-56c-0369.pdf 
 Identifier    ZNC-2001-56c-0369 
 Volume    56