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1981 (1)
1Author    Klaus Pfister, H. Artm, K. Lichtenthaler, G. Ünther Burger, Hans Musso, M.Anuel ZahnRequires cookie*
 Title    The Inhibition of Photosynthetic Light Reactions by Halogenated Naphthoquinones  
 Abstract    Halogenated naphthoquinones act as inhibitors o f photosynthetic electron flow. I50 concentra­ tion for inhibition of methylviologen reduction were found to range between 2 x 10-5 m to 2 x 10-6 M. Comparing their effects on several partial reactions o f electron flow, the inhibition site o f the naphthoquinones was found to be at the reducing site o f PS II. Studies o f fluorescence transients in presence o f halogenated naphthoquinones give further evidence for a site action similar to that o f diuron and different to that of DBMIB. All naphthoquinones act as quenchers o f chlorophyll fluorescence with pure chlorophyll a, and with much higher efficiency in green algae and chloroplasts. It is concluded, that the halogenated naphthoquinones act similar to PS II-inhibitors like diuron, but do not share a common binding site at the PS II-complex. Implications of a possible involvement of phylloquinone K 1 in photosynthetic electron transport are discussed. The synthesis o f 2-chloro-as well as 2-bromo-3-isopropyl-1,4-naphthoquinone is described. 
  Reference    Z. Naturforsch. 36c, 645—655 (1981); received April 271981 
  Published    1981 
  Keywords    Chlorophyll Fluorescence, Electron Transport, Inhibitors, Naphthoquinones, Photosynthesis, Quenchers 
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 TEI-XML for    default:Reihe_C/36/ZNC-1981-36c-0645.pdf 
 Identifier    ZNC-1981-36c-0645 
 Volume    36