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1979 (2)
1Author    RichardJ. Youngman, AlanD. DodgeRequires cookie*
 Title    Mechanism of Paraquat Action: Inhibition of the Herbicidal Effect by a Copper Chelate with Superoxide Dismutating Activity  
 Abstract    The treatment of flax cotyledons (Linum usitatissimum) with paraquat was shown to decrease the levels of chlorophyll and carotenoid pigments. The fatty acid content of chloroplast fragments isolated from treated tissue was determined and shown to be greatly decreased by paraquat treat­ ment. The superoxide radical was demonstrated to play an important role in the phytotoxic action of paraquat by the use of a copper chelate of D-penicillamine, which has a high superoxide dismutat­ ing activity. The action of paraquat was inhibited by this compound. The role of superoxide is discussed with reference to the generation of more toxic species, such as singlet oxygen. 
  Reference    Z. Naturforsch. 34c, 1032—1035 (1979); received May 26 1979 
  Published    1979 
  Keywords    Paraquat, Plant Pigments, Fatty Acids, Superoxide, Copper Chelate, Flax Cotyledons 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-1032.pdf 
 Identifier    ZNC-1979-34c-1032 
 Volume    34 
2Author    KennethE. Pallett, AlanD. DodgeRequires cookie*
 Title    The Role of Light and Oxygen in the Action of the Photosynthetic Inhibitor Herbicide Monuron  
 Abstract    Monuron treatment of detached flax cotyledons caused a rapid inhibition of C 02 fixation in darkness and light. Chlorophyll breakdown was promoted by increased light intensity. Ethane generation, an indicator of membrane damage, increased as the chlorophyll level decreased. The carotene pigments were destroyed more rapidly than the xanthophylls and chlorophylls. Treatment of cotyledons with monuron in the absence of oxygen almost prevented carotenoid and chlorophyll loss. The addition of the singlet oxygen quencher DABCO delayed chlorophyll breakdown. The results are discussed in relation to a role for singlet oxygen in the herbicidal action of monuron. 
  Reference    Z. Naturforsch. 34c, 1058—1061 (1979); received May 29 1979 
  Published    1979 
  Keywords    Herbicidal Action of Monuron, Light, Oxygen, Singlet Oxygen, Plant Pigments 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-1058.pdf 
 Identifier    ZNC-1979-34c-1058 
 Volume    34