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1990 (1)
1984 (1)
1Author    Carl Fedtke, RobertH. Strang, Bayer Ag, Geschäftsbereich Pflanzenschutz, Biologische Anwendungstechnik, ForschungRequires cookie*
 Title    Synergistic Activity of the Herbicide Safener Dichlormid with Herbicides Affecting Photosynthesis  
 Abstract    Dichlormid, a safener for thiolcarbamate herbicides, was tank-mixed with several herbicidal inhibitors of photosystem II, or with the herbicide acifluorfen, and applied postemergence to Ipomoea hederacea plants. Dichlormid had no visible effects on the plants when applied alone, but interacted synergistically with the herbicides in the combination treatments. Dichlormid strongly decreased the ascorbic acid levels in the Ipom oea hederacea cotyledons. Ascorbate is known to protect plant tissue from photooxidative damage. The herbicides which interacted synergistically with dichlormid are believed to generate their phytotoxic action via the produc­ tion of excess singlet oxygen. It is suggested that the decreased ascorbate levels in the Ipomoea hederacea cotyledons after dichlormid treatment result in an impaired singlet oxygen scaveng­ ing system and consequently lead to increased plant damage in the presence of singlet oxygen generating herbicides. 
  Reference    Z. Naturforsch. 45c, 565—567 (1990); received October 13 1989 
  Published    1990 
  Keywords    Herbicide, Synergism, Safener, Oxygen Toxicity, Ascorbic Acid 
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 TEI-XML for    default:Reihe_C/45/ZNC-1990-45c-0565.pdf 
 Identifier    ZNC-1990-45c-0565 
 Volume    45 
2Author    EvaP. Aur, RichardJ Y Oungm An, E. Dm, L. En, G. Feld Er, ErichF E LstnerRequires cookie*
 Title    Mechanisms of Adriamycin-Dependent Oxygen Activation Catalyzed by NADPH-Cytochrome c*-(Ferredoxin)-Oxidoreductase  
 Abstract    Under aerobic conditions, 0 2 uptake and production o f 0 2~ and H 20 2 by isolated N A D P H -cytochrome c-(ferredoxin)-oxidoreductase from Euglena gracilis was strongly stim ulated by adriamycin. Further stim ulation was not observed with 0.1 m M F e 3+-EDTA. M ethionine fragmentation (measured as ethylene release), as a reliable indicator for the formation o f O H ' radical-like oxidants under aerobic conditions (1 0 0 |im o l 0 2 in a 10 ml reaction vessel) was strongly stimulated by 0.1 m M F e3+-ED TA or, in the absence o f iron, by partial anaerobiosis (1 (irnol 0 2 per vessel). The highest rate o f m ethionine fragm entation was observed under an­ aerobic conditions in the presence o f both reduced adriam ycin and added H 20 2. Aerobic methionine fragmentation in the presence o f adriam ycin and F e3+-ED TA was inhibited by superoxide dismutase and catalase by m ore than 90%, w hile m ethionine fragmen­ tation under semianaerobiosis in the absence o f F e 3+-E D T A was inhibited by superoxide dismutase to only about 50%, while catalase again inhibited by m ore than 90%. These results indicate that the adriamycin-catalyzed production o f a strong oxidant appears to be governed by different mechanisms depending on oxygen availability; nam ely the production o f a Fenton-type oxidant driven by adriamycin-catalyzed superoxide form ation and also, the formation o f the "crypto-OH' radical" by direct electron donation from the adriam ycin sem iquinone radical to H20 2 under oxygen limiting conditions. 
  Reference    Z. Naturforsch. 39c, 261—267 (1984); received D ecem ber 15 1983 
  Published    1984 
  Keywords    Adriamycin, Oxygen Activation, Oxygen Toxicity, Superoxide, H ydroxyl Radical 
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 TEI-XML for    default:Reihe_C/39/ZNC-1984-39c-0261.pdf 
 Identifier    ZNC-1984-39c-0261 
 Volume    39