| | 1 | Author
| ErichF. Elstner, W. Osswald | Requires 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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| default:Reihe_C/35/ZNC-1980-35c-0129.pdf | | | | Identifier
| ZNC-1980-35c-0129 | | | | Volume
| 35 | |
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