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'Herbicides' in keywords Facet   section ZfN Section C  [X]
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1Author    ErichF. Elstner, W. OsswaldRequires cookie*
 Title    Chlorophyll Photobleaching and Ethane Production in Dichlorophenyldimethylurea-(DCMU) or Paraquat-Treated Euglena gracilis Cells  
 Abstract    Light dependent (35 Klux) chlorophyll bleaching in autotrophically grown Euglena gracilis cells at slightly acidic pH (6.5 —5.4) is stimulated by the photosystem II blockers DCMU and DBMIB (both 10~5 m) as well as by the autooxidizable photosystem I electron acceptor, paraquat (1 0 -3 m). Chlorophyll photobleaching is accompanied by the formation o f thiobarbituric acid — sensitive material ("malondialdehyde") and ethane. Both chlorophyll photobleaching and light dependent ethane formation are partially prevented by higher concentrations (10~* m) o f the autooxidizable photosystem II electron acceptor DBMIB or by sodium bicarbonate (25 m M). In vitro studies with cell free extracts (homogenates) from E. gracilis suggest that a-linolenic acid oxidation by excited (reaction center II) chlorophyll represents the driving force for both ethane formation and chlorophyll bleaching. Ethane formation thus appears to be a sensitive and non-destructive "in vivo'' marker for both restricted energy dissipation in photosystem II and, conditions yielding reactive oxygen species at the reducing side o f photosystem I. 
  Reference    Z. Naturforsch. 35c, 129—135 (1980); received August 20/September 28 1979 
  Published    1980 
  Keywords    Chlorophyll Bleaching, Herbicides, Euglena gracilis, Ethane, Fat Oxidation 
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 TEI-XML for    default:Reihe_C/35/ZNC-1980-35c-0129.pdf 
 Identifier    ZNC-1980-35c-0129 
 Volume    35