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41Author    G.Erhard Sandm, R. Olf, Lam Bert, Peter BögerRequires cookie*
 Title    Multifunctional Mode of Action of Substituted Nitrodiphenylethers in Scenedesmus Cells  
 Abstract    Nitrodiphenylethers substituted with Cl, CF3, and other comparatively simple substituents are compared with respect to their primary effects on the photosynthetic apparatus. These are direct electron-transport inhibition, energy-transfer inhibition (of ATP synthesis), and pigment bleach­ ing, the latter accompanied by decrease o f electron transport activity. Certain substituents and their positions at the diphenylether skeleton can be correlated with a particular influence on these phytotoxic effects. The unicellular alga, Scenedesmus, is an appropriate species to fumisch quantitative data on these primary herbicidal modes of action within a 24-h assay period. 
  Reference    Z. Naturforsch. 36c, 633 (1981); received March 311981 
  Published    1981 
  Keywords    Nitrodiphenylethers, Energy-Transfer Inhibition of ATP Synthesis, Herbicides, Photosynthetic Electron Transport, Pigment Bleaching 
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 TEI-XML for    default:Reihe_C/36/ZNC-1981-36c-0633.pdf 
 Identifier    ZNC-1981-36c-0633 
 Volume    36 
42Author    Zoltán Szigeti, Éva Sárvári, Endre LehoczkiRequires cookie*
 Title    Chlorophyll Proteins and Lipids in Paraquat Treated Sensitive and Resistant Cony za Canadensis Leaves  
 Abstract    Photosynthetic activity and molecular com position o f thylakoid membranes o f sensitive and atrazine/paraquat coresistant biotypes o f Conyza canadensis (L.) Cronq was compared before and after 5 x 10~4 molar paraquat spraying. In contrast to the irreversibly damaged sensitive plants the Rfd values (vitality indices) calculated from parameters o f fluorescence induction curves, and the in vivo C 0 2 fixation in resistant plants showed -after a transitory inhibition -a recovery. Resistant thylakoids contained higher amount o f PS II and LHC II, (i.e. lower relative amount o f CP I) which can be the result o f an adaptation process. Fatty acid com position o f total leaf extract was almost the same in both biotype even after spraying. The amount o f the oligomeric form o f LHCP II decreased in paraquat treated sensitive thylakoids, which was in correlation with the reduction o f A3-transhexadecanoic acid content. Decrease in oligom eric LHCP II and/or special lipids (PG) in sensitive thylakoids may change the association o f LHCP II and photosystem II core as it is evidenced from lowering o f the M g2+ induced changes o f the short wavelength fluorescence intensity and increase in the relative quantum requirement values. The results are discussed in connection with a possible effect o f paraquat on PS II. 
  Reference    Z. Naturforsch. 47c, 400 (1992); received January 20 1992 
  Published    1992 
  Keywords    Paraquat/Atrazine Coresistance, Conyza canadensis, Chlorophyll-Protein Complexes, C hloro­ plast Lipids, Herbicides 
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 TEI-XML for    default:Reihe_C/47/ZNC-1992-47c-0400.pdf 
 Identifier    ZNC-1992-47c-0400 
 Volume    47 
43Author    KlausG. Tietjen, Wilfried Draber, John Goossens, JohannesR. Jansen, JoachimF. Kluth, Michael Schindler, Heinz-Jürgen, Wroblowsky Bayer, A. G.Requires cookie*
 Title    Binding of Triazines and Triazinones in the QB-Binding Niche of Photosystem II  
 Abstract    A series o f 20 triazines (derivatives o f 2-alkylam ino-4-benzylam ino-6-chloro-l,3,5-triazines) and 37 triazinones (derivatives o f 3-alkyl-4-am ino-6-phenyl-l,2,4-triazin-5-ones) is tested for inhibitory potency in photosynthetic electron flow through photosystem II o f wild type Chla-mydomonas reinhardtii and o f five mutants with aminoacid substitutions in the D 1 protein at valine 219, alanine 251, phenylalanine 255, serine 264, and leucine 275. The data are used for computer modelling o f .the possible location o f the com pounds within a three dimensional model o f the QB-binding niche o f the D 1 protein. 
  Reference    Z. Naturforsch. 48c, 205 (1993); received November 23 1992 
  Published    1993 
  Keywords    D 1 Protein, Herbicides, Molecular M odeling, Photosystem II, Q B-Binding Niche 
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 TEI-XML for    default:Reihe_C/48/ZNC-1993-48c-0205.pdf 
 Identifier    ZNC-1993-48c-0205 
 Volume    48 
44Author    Peter BögerRequires cookie*
 Title    Multiple Modes of Action of Diphenyl Ethers  
  Reference    Z. Naturforsch. 39c, 468 (1984); received N ovem ber 15 1983 
  Published    1984 
  Keywords    Herbicides, Electron Transport, Peroxidation, N itro/N on-nitro-d iphenyl Ethers, Carotenogenesis, m-Phenoxybenzamides, ATP-Synthase, Stress Response 
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 TEI-XML for    default:Reihe_C/39/ZNC-1984-39c-0468.pdf 
 Identifier    ZNC-1984-39c-0468 
 Volume    39