| | 1 | Author
| B. K. Jeldstad, A. Johnsson, K.M F Uruheim, A. Schie, B. Ergan, J. K. Rane | Requires cookie* | | | Title
| Hyperthermia Induced Polyphosphate Changes in Propionibacterium acnes as Studied by 31P NMR  | | | | Abstract
| The polyphosphate component in MP NMR spectra of the Gram-positive Propionibacterium acnes increased after hyperthermia treatment. The cells were exposed to temperatures in the interval from 15 °C to 45 °C. The amount of polyphosphate increased with increasing tempera ture. There were no temperature induced changes in the other phosphorous components seen in the spectra with exception of a decrease in ATP for higher temperatures. The increase in poly phosphates was less than that obtained from cells irradiated by near ultra-violet light. | | | |
Reference
| Z. Naturforsch. 44c, 45 (1989); received October 10. 1988 | | | |
Published
| 1989 | | | |
Keywords
| Polyphosphates, Hyperthermia, 31P NM R, Propionibacterium acnes, Oxidative Stress | | | |
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| default:Reihe_C/44/ZNC-1989-44c-0045.pdf | | | | Identifier
| ZNC-1989-44c-0045 | | | | Volume
| 44 | |
| 3 | Author
| Barbara Lederer, OliverCarsten Knörzer, Peter Böger | Requires 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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| default:Reihe_C/54/ZNC-1999-54c-0764.pdf | | | | Identifier
| ZNC-1999-54c-0764 | | | | Volume
| 54 | |
| 5 | Author
| Peter Streb, Ann Herm, Jürgen Schaub, Feierabend | Requires cookie* | | | Title
| Latent Oxidative Stress Responses of Ozone-Fumigated Cucumber Plants Are Enhanced by Simultaneous Cold Exposures | | | | Abstract
| Cucumber plants (Cucumis sativus L.) were grown under controlled conditions and fumi gated with either 0 3, diluted autom obile exhaust or a combination of both. The ratio of variable to maximum chlorophyll fluorescence (FJFm) was estimated as a measure of PSII activity Activities of the enzymes catalase, glutathione reductase and guaiacol-dependent peroxidase and contents o f the antioxidants ascorbate and glutathione were assayed as poten tial indicators of oxidative stress. The behavior of catalase and of PSII are of particular diagnostic interest because they require continuous repair in light. Exposures of up to 13 days to moderate concentrations of the pollutant gases alone did not induce striking changes in any of the activities that were assayed. A lso when the plants were subjected to an addi tional stress treatment by exposing them to 4 short cold treatments (2h each at 0 -4 °C in light on days 12-15 after sowing) which induced marked declines o f the FJFm ratio, the chlorophyll content and the catalase activity, these cold-induced symptoms of photodamage were not significantly enhanced by the fumigation treatments. However, increases of the activities of glutathione reductase and peroxidase observed during a period of recovery following the cold-exposures were markedly higher in 0 3-fumigated plants, as compared to plants grown in filtered air or fumigated with car exhaust alone. The results emphasize that effects of moderate pollutant exposures may be latent or delayed over long time periods and that defence responses can be enhanced when plants are exposed to additional, naturally occurring stress situations. | | | |
Reference
| Z. Naturforsch. 51c, 355 (1996); received January 26/February 23 1996 | | | |
Published
| 1996 | | | |
Keywords
| Cucumis sativus (Cucumber), Autom obile Exhaust, Latent Injury, Oxidative Stress, Ozone | | | |
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| default:Reihe_C/51/ZNC-1996-51c-0355.pdf | | | | Identifier
| ZNC-1996-51c-0355 | | | | Volume
| 51 | |
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