| | 1 | Author
| W. I. Gruszecki3, K. Strzałkab, A. R. Adunzc, J. K. Rukb, G. H. Schmidc | Requires cookie* | | | Title
| Blue Light-Enhanced Photosynthetic Oxygen Evolution from Liposome-Bound Photosystem II Particles; Possible Role of the Xanthophyll Cycle in the Regulation of Cyclic Electron Flow Around Photosystem II?  | | | | Abstract
| Light-driven electron transport in liposom e-bound photosystem II (PS-II) particles be tween water and ferricyanide was monitored by bare platinum electrode oxymetry. The m odi fication of the experimental system with the exogenous quinones a-tocopherol quinone (a-TQ) or plastoquinone (PQ) resulted in a pronounced effect on photosynthetic oxygen evolution. The presence o f a-tocopherolquinone (a-T Q) in PS-II samples decreased the rate of red light-induced oxygen evolution but increased the rate o f green light-induced oxygen evolution. Blue light applied to the assay system in which oxygen evolution was saturated by red light resulted in a further increase o f the oxygen signal. These findings are interpreted in terms of a cyclic electron transport around PS-II, regulated by an excitation state of ß-carotene in the reaction centre of PS-II. A mechanism is postulated according to which energetic coupling of ß-carotene in the reaction centre of PS-II and that o f other antenna carotenoid pigments is regulated by the portion of the xanthophyll violaxanthin, which is under control of the xanthophyll cycle. | | | |
Reference
| Z. Naturforsch. 50c, 61—6 (1995); received June 15/November 11 1994 | | | |
Published
| 1995 | | | |
Keywords
| a-Tocopherol Quinone, Plastoquinone-9, Oxygen Evolution, Photosystem II, Cyclic Electron Transport, Xanthophyll Cycle | | | |
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| ZNC-1995-50c-0061 | | | | Volume
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