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1998 (1)
1Author    F. Rank Terjung, K. Arlheinz, M. AierRequires cookie*
 Title    Nonphotochemical Quenching of Chlorophyll Fluorescence in Higher Plant Leaves Studied by Delayed Fluorescence Decay Measurements  
 Abstract    Delayed chlorophyll fluorescence decay measurements on the second time scale were ap­ plied to investigate the state of photosystem II under different photosynthetic conditions. Leaves adapted to high and low light intensities were used to study the effects of nonphoto­ chemical quenching (energy quenching) on the photosynthetic state. 3-(3,4-dichlorophenyl)-1,1-dimethylurea (DCM U)-treated leaves were used to characterize the photosynthetic state in the absence of a transthylakoid ApH, dithiothreitol (D TT)-treated leaves in the absence of the xanthophyll zeaxanthin. The fast decay components were the most affected by energy quenching as indicated by increased decay times. The slowest decay com ponent was hardly affected, neither in amplitude nor in decay time. The measurem ents indicate a relaxation of energy quenching on the second time scale and the absence of damages in the electron transfer chain of PS II. The constant decay times of the DTT-treated leaf, com parable to those of the DCM U-treated leaf, indicate the obligatory role of zeaxanthin for most of the detected energy quenching. 
  Reference    Z. Naturforsch. 53c, 27—32 (1998); received October 9/October 31 1997 
  Published    1998 
  Keywords    Delayed Fluorescence, Energy Quenching, Pisum sativum, Xanthophyll Cycle 
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 TEI-XML for    default:Reihe_C/53/ZNC-1998-53c-0027.pdf 
 Identifier    ZNC-1998-53c-0027 
 Volume    53