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'Oxidative Stress' in keywords Facet   Publication Year 1999  [X]
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1999[X]
1Author    Herman Clijsters, Ann Cuypers, Jaco VangronsveldRequires cookie*
 Title    Physiological Responses to Heavy Metals in Higher Plants; Defence against Oxidative Stress  
 Abstract    Depending on the physiological process investigated heavy metal phytotoxicity can be either inhibitory or stimulatory. Photosynthesis and its partial light and dark reactions are inhibited; the activity of various enzymes, located in several cell compartiments, is increased. These enzymes are mostly induced since metals affect the transcription activity. They appear to be related to the plant defence against oxidative stress caused by metal phytotoxicity. Careful examination of the time course of this induction reveals differences in response between the metals applied. 
  Reference    Z. Naturforsch. 54c, 730—7 (1999); received November 22 1998/April 10 1999 
  Published    1999 
  Keywords    Heavy Metals, Photosynthesis, Enzyme Induction, Oxidative Stress, Plant Defence Mechanisms 
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 TEI-XML for    default:Reihe_C/54/ZNC-1999-54c-0730.pdf 
 Identifier    ZNC-1999-54c-0730 
 Volume    54 
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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 DEBUG INFO      
 TEI-XML for    default:Reihe_C/54/ZNC-1999-54c-0764.pdf 
 Identifier    ZNC-1999-54c-0764 
 Volume    54