| | 1 | Author
| Maya Velitchkova, A. Ntoaneta Popova, Tzvetelina Markova | Requires 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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| default:Reihe_C/56/ZNC-2001-56c-0369.pdf | | | | Identifier
| ZNC-2001-56c-0369 | | | | Volume
| 56 | |
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