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1993 (1)
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1Author    Jörg Durner, Andreas Thiel, Peter BögerRequires cookie*
 Title    Phenolic Herbicides: Correlation between Lipophilicity and Increased Inhibitory Sensitivity of Thylakoids from Higher Plant Mutants  
 Abstract    , being quite hydrophilic as compared to classical photosystem-II inhibitors do not exhibit a correlation between inhibitory activity and partition coefficient. Sensitivity against phenolic herbicides, however, as observed with atrazine-resistant thylakoids from higher plants mutants (Brassica napus) is increased by higher partition coefficients. 
  Reference    Z. Naturforsch. 41c, 881 (1986); received May 26 1986 
  Published    1986 
  Keywords    Brassica napus, Atrazine-Resistant Mutants, Resistance Factors, Partition Coefficient Phenolic herbicides 
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 TEI-XML for    default:Reihe_C/41/ZNC-1986-41c-0881.pdf 
 Identifier    ZNC-1986-41c-0881 
 Volume    41 
2Author    R. Hain, J. E. ThomzikRequires cookie*
 Title    Segregation of Triazine-Resistant Chloroplasts after Introduction into Winter Type Oilseed Rape (Brassica napus L.) by Protoplast Fusion  
 Abstract    Triazine-resistant chloroplasts o f the Canadian spring oilseed rape variety OAC Triton were transferred into four German winter oilseed rape lines and two cultivars o f double-low quality by means o f protoplast fusion. X-irradiation has been used to reduce the am ount o f nuclear D N A o f the spring type cultivar and to promote cybrid formation. RFLP-analysis showed that some regenerants and their progeny carried both types o f chloroplasts. In som e instances regenerants and progeny containing mixtures o f both chloroplasts not kept under selective conditions lost their triazine-resistant chloroplasts completely during further plant growth. Preliminary results o f greenhouse and field experiments indicate that volunteer plants can be eliminated by application o f 1 5 0 -3 0 0 g/ha metribuzin (SencorR, Bayer A G) in a stand o f triazine-resistant oilseed rape o f double-low quality. 
  Reference    Z. Naturforsch. 45c, 478 (1990); received September 8 1989 
  Published    1990 
  Keywords    Brassica napus, Somatic Hybridization, Triazine resistance, Chloroplast segregation, RFLP-analysis 
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 TEI-XML for    default:Reihe_C/45/ZNC-1990-45c-0478.pdf 
 Identifier    ZNC-1990-45c-0478 
 Volume    45 
3Author    JohnN. Phillips, WendyK. BanhamRequires cookie*
 Title    Hydrogen Bonding of Cyanoacrylates with the D 1 Peptide  
 Abstract    Representatives o f two structural types o f cyanoacrylate PS II inhibitors have been studied in respect to their p/ 50 values and qualitative rate o f binding with wild type and S 2 6 4 G mutant thylakoids isolated from Brassica napus. Both are potent inhibitors o f photosynthetic electron transport and both show a large discrimination between wild type and mutant thylakoids under equilibrium conditions. However one, an N-m ethylanilino cyanoacrylate, has an initial rapid reaction with both wild type and mutant thylakoids, but continues to react slowly with the wild type species until equilibrium is reached, while the other, a benzylamino cyanoacry­ late, equilibrates rapidly with both species as does the classical PS II inhibitor, atrazine. These differences in kinetic behaviour have been interpreted in terms o f different H-bond interac­ tions with the serine-264 hydroxyl group. It is suggested that the slow binding reaction is due to the N -m ethylanilino com pound interacting as an H-bond acceptor with the serine-264 hy­ droxyl hydrogen thus disrupting an intramolecular ser-264-his-252 H-bond within the D 1 peptide. Rapid equilibration on the other hand, has been attributed to the benzylam ino deriva­ tive acting as an H-bond donor to the serine-264 hydroxyl oxygen and strengthening the 2 6 4 -2 5 2 H -bond by conjugation. It is proposed that atrazine and other classical PS II inhibi­ tors act in this way and that this may explain their ability to inhibit trypsin degradation o f the D 1 peptide, if the 2 6 4 -2 5 2 intramolecular H-bond plays an important role in stabilizing the peptide conform ation. It is also speculated that photodegradation may be related to the ability o f Q b~ to act as an H-bond acceptor and disrupt the 2 6 4 -2 5 2 H-bond. 
  Reference    Z. Naturforsch. 48c, 132 (1993); received N ovem ber 16 1992 
  Published    1993 
  Keywords    Brassica napus, Cyanoacrylates, D 1 Peptide, H -Bonding, Photodegradation 
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 TEI-XML for    default:Reihe_C/48/ZNC-1993-48c-0132.pdf 
 Identifier    ZNC-1993-48c-0132 
 Volume    48