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1999 (1)
1983 (1)
1Author    N.Requires cookie*
 Title    Variable Fluorescence and Fluorescence Spectra of Algae after Herbicide-Induced Pigment Bleaching  
 Abstract    avassard V. K a ra p e ty a n 3. R eto S tra sse rb, and Peter B ö g erc a A. N. Bakh Institute o f Biochemistry, Academy of Sciences o f the USSR, Moscow; Herbicides like norflurazon, oxadiazon, or oxyfluorfen affect the pigment apparatus o f green algae. Their influence on variable (Fmax _ ^o) and initial fluorescence (F0) as well as on the state 
  Reference    Z. Naturforsch. 38c, 556 (1983); received March 23 1983 
  Published    1983 
  Keywords    Norflurazon, Oxadiazon, Oxyfluorfen, Bleaching by Herbicides, Fluorescence Induction, Spectra 
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 TEI-XML for    default:Reihe_C/38/ZNC-1983-38c-0556.pdf 
 Identifier    ZNC-1983-38c-0556 
 Volume    38 
2Author    Barbara Lederer, OliverCarsten Knörzer, Peter BögerRequires cookie*
 Title    Differential Gene Expression in Plants Stressed by the Peroxidizing Herbicide Oxyfluorfen  
 Abstract    The response of plants to the peroxidizing herbicide oxyfluorfen was investigated. The action of this p-nitrodiphenyl ether is based on inhibition of plastidic protoporphyrinogen oxidase, which leads to accumulation of protoporphyrin IX in the cytosol yielding reactive oxygen species by light activation. The induction of activities of antioxidative enzymes was followed in Nicotiana tabacum plants, var. BelW 3. Glutathione reductase activity was ele­ vated by 75% compared to control, m onodehydroascorbate reductase by 65% and glutathi­ one 5-transferase by 110% . The mRNA of ascorbate peroxidase and catalase isoform 2 was induced, the catalase isoform 1 was reduced. These findings were confirmed and supported by measuring enzymatic activity changes in photoheterotrophically grown soybean (Glycine m ax) suspension cultures. To find a possible involvement of compounds regulating oxidative stress response, we investigated the influence of salicylic acid and BTH (benzo(l,2,3)thiadia-zole-7-carbothioic acid 5-m ethylester), both inducers of pathogen defense, on soybean cell suspension cultures. The specific activities of glutathione reductase, m onodehydroascorbate reductase and glutathione 5-transferase increased strongly, comparable to oxyfluorfen treat­ ment. Both compounds protected the cells against oxyfluorfen-induced lipid peroxidation and alleviated the accumulation of protoporphyrin IX. 
  Reference    Z. Naturforsch. 54c, 764—7 (1999); received November 8 1998/M arch 6 1999 
  Published    1999 
  Keywords    Antioxidative Enzymes, Lipid Peroxidation, Oxidative Stress, Oxyfluorfen, Protoporphyrin IX 
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 TEI-XML for    default:Reihe_C/54/ZNC-1999-54c-0764.pdf 
 Identifier    ZNC-1999-54c-0764 
 Volume    54