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41Author    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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 DEBUG INFO      
 TEI-XML for    default:Reihe_C/47/ZNC-1992-47c-0400.pdf 
 Identifier    ZNC-1992-47c-0400 
 Volume    47 
42Author    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 
43Author    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 
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