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'Scenedesmus acutus' in keywords
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1979 (2)
1Author    Gerhard Sandmann, Karl-Josef Kunert, Peter BögerRequires cookie*
 Title    Biological Systems to Assay Herbicidal Bleaching  
 Abstract    Two strains of Scenedesmus acutus were found useful to study the influence of bleaching agents on either the greening process or the fully pigmented algal cell during growth. Both physiological conditions exhibit high sensitivity to bleaching herbicides. With this new assay, contrasting bleach­ ing effects with the same compound can be found allowing differentiation of the herbicidal action of bleaching agents which apparently is a multifunctional one. Furthermore, the I50 can be determined rather rapidly in a simple graphical method by a Dixon plot. A subsequent application of bleaching herbicides to cultures of the fungus Phycomyces blakesleeanus rules out a possible specific action of the compounds assayed on chlorophyll or photosynthetic redox carriers. This latter assay can show whether or not the herbicides synthesis as is the case with difunon or SAN 9789. 
  Reference    Z. Naturforsch. 34c, 1044—1046 (1979); received June 30 1979 
  Published    1979 
  Keywords    Bleaching Herbicides, Algae, Scenedesmus acutus, Wild-type and Mutant 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-1044.pdf 
 Identifier    ZNC-1979-34c-1044 
 Volume    34 
2Author    Karl-JosefK. Unert, Peter BögerRequires cookie*
 Title    Influence of Bleaching Herbicides on Chlorophyll and Carotenoids  
 Abstract    Over 24 and 48 hour cultivation periods the influence of SAN 9789 (norflurazon), EMD-IT 5914 (difunon) and fluridone on growth, photosynthetic oxygen evolution and pigment content of the green alga Scenedesmus acutus was determined. Four effects were observed: a) Both carotenoid and chlorophyll formation were inhibited. b) Carotenoids were destroyed in the presence of air, but not nitrogen. The level of chlorophyll, however, did not change. c) ß-(and a-) carotene was markedly decreased in the presence of oxygen. d) Photosynthetic oxygen evolution was decreased with the disappearance of carotenoids. These effects, which are accompanied by reduced growth, are believed to represent primary herbicidal modes of action. The decrease of oxygen evolution is not due to a direct inhibition of photosynthetic electron transport by the herbicides applied. 
  Reference    Z. Naturforsch. 34c, 1047 (1979); received June 30 1979 
  Published    1979 
  Keywords    Bleaching Herbicides, Algae, Scenedesmus acutus, Carotenoids, Chlorophyll, Air/Nitrogen Gassing 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-1047.pdf 
 Identifier    ZNC-1979-34c-1047 
 Volume    34