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1979 (1)
1Author    A. TrebstRequires cookie*
 Title    Inhibition of Photosynthetic Electron Flow by Phenol and Diphenylether Herbicides in Control and Trypsin-Treated Chloroplasts  
 Abstract    Alkyl substituted 2-halogen-4-nitro-phenols (like brom onitrothymol) are potent inhibitors of photosynthetic electron flow in chloroplasts. There inhibition site is identical to that of DCMU, though the phenols do not contain th eir essential chemical elem ent responsible for inhibition nor do they follow their correlation of chemical structure and biochemical function. Binding of labelled m etribuzin on the chloroplast m em brane and its replacem ent by the phenol inhibitors support the notion of identical binding sites, however. In trypsin treated chloroplasts, the prim ary acceptor of photosystem II becomes accessible to ferricyanide, whose photoreduction is therefore DCMU insensitive. A fter trypsin treatm ent also the sensitivity of ferricyanide reduction to phenol inhibitors is lost as is the binding of labelled m etri­ buzin. The dinitrophenylethers of brom onitrothym ol and of ioxynil and other diphenylethers are potent inhibitors of photosynthetic electron flow. T heir site of inhibition is after the function of plasto-quinone, i. e. they are DBMIB analogues. 
  Reference    Z. Naturforsch. 34c, 986 (1979); received May 26 1979 
  Published    1979 
  Keywords    Photosynthesis, Herbicides, Trypsin Treatm ent, Brom onitrothymol, Ioxynil, Diphenylether 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0986.pdf 
 Identifier    ZNC-1979-34c-0986 
 Volume    34