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1995 (1)
1980 (1)
1Author    K.H G Rum Bach, B. FomRequires cookie*
 Title    Chloroplast Autonomy in Acetyl-Coenzyme-A-Formation and Terpenoid Biosynthesis  
 Abstract    Isolated intact spinach chloroplasts were supplied with 14C-labeled C 0 2, phosphoglycerate, phos-phoenolpyruvate, acetate and mevalonate and the incorporation o f radioactivity into /?-carotene and plastoquinone-9 assayed. All applied substrates were capable of crossing the chloroplast envelope. Except phosphoenolpyruvate all radioactive precursors were incorporated into ß-carotene and also into plastoquinone-9. It is concluded that spinach chloroplasts are autonom in acetyl-coenzyme-A-formation and terpenoid biosynthesis. There is a direct carbon flow from intermediates of the Calvin-cycle via acetyl-coenzyme-A and mevalonic acid existing in the chlo­ roplast leading to the carotenoids and isoprenoid side-chains o f chlorophylls and quinones. 
  Reference    Z. Naturforsch. 35c, 645—648 (1980); received March 25 1980 
  Published    1980 
  Keywords    Biosynthesis, /?-Carotene, Chloroplast, Plastoquinone-9, Terpenoids 
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 TEI-XML for    default:Reihe_C/35/ZNC-1980-35c-0645.pdf 
 Identifier    ZNC-1980-35c-0645 
 Volume    35 
2Author    W. I. Gruszecki3, K. Strzałkab, A. R. Adunzc, J. K. Rukb, G. H. SchmidcRequires 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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 TEI-XML for    default:Reihe_C/50/ZNC-1995-50c-0061.pdf 
 Identifier    ZNC-1995-50c-0061 
 Volume    50