Go toArchive
Browse byFacets
Bookbag ( 0 )
'Photoinhibition' in keywords Facet   Publication Year 1998  [X]
Results  1 Item
Sorted by   
Section
Publication Year
1998[X]
1Author    Kiriakos Kotzabasis3, D. Ieter, D. Örnem AnnbRequires cookie*
 Title    Differential Changes in the Photosynthetic Pigments and Polyamine Content during Photoadaptation and Photoinhibition in the Unicellular Green Alga Scenedesmus obliquus  
 Abstract    In the unicellular green alga Scenedesmus obliquus the level o f photoinhibition and the recovery of the cells after reversal to the initial light conditions in relation to the pre-photo-adaptation of the culture to low, medium and high light intensity was determined. The changes in the photosynthetic pigment content and in the intracellular polyam ine concentra­ tion allowed to distinguish between photoadaptation and photoinhibition. In particular, the level of chlorophylls, xanthophylls and carotenoids decreased inversely proportional to the light intensity applied during photoadaptation, whereas their concentrations remained con­ stant during photoinhibition. The violaxanthin/zeaxanthin and the loroxanthin/lutein cycle work only under photoinhibitory conditions, but not under photoadaptive premises. Changes in the level of these carotenoids in relation to the changes in the photosynthetic apparatus during photoadaptation are discussed. In addition, it was found that the intracellular polya­ mine level increased only under stress conditions, i. e. during photoinhibition, and decreased during recovery of the cells after reversal to the initial light conditions. The increase of the putrescine level during photoinhibition is inversely proportional to the light intensity used for pre-adaptation. This rise of the polyamine level in the cells photoadapted to high light conditions is an additional indication for the finding that photoadaptation and photoinhibi­ tion are different phenomena which are clearly distinguishable from each other. Finally, the changes of the chlorophyll, violaxanthin, zeaxanthin, loroxanthin, lutein and polyamine levels under photoadaptation in high light intensity (50 W m '2) in relation to the range of photo­ adaptation in Scenedesmus obliquus are discussed. 
  Reference    Z. Naturforsch. 53c, 833—8 (1998); received May 8/June 15 1998 
  Published    1998 
  Keywords    Polyamines, Photosynthetic Apparatus, Photoinhibition, Photoadaptation, Scenedesmus obliquus 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_C/53/ZNC-1998-53c-0833.pdf 
 Identifier    ZNC-1998-53c-0833 
 Volume    53