Document Detail

Non-photochemical quenching kinetics during the dark to light transition in relation to the formation of antheraxanthin and zeaxanthin.
MedLine Citation:
PMID:  14990382     Owner:  NLM     Status:  MEDLINE    
Nonlinear regression analysis (NLR) is applied to quantify the dynamic response of non-photochemical fluorescence quenching (NPQ) of Trifolium repens cv. Regal upon dark to light transition. Commonly, only steady-state levels of NPQ are evaluated, ignoring transient kinetics. Experimental NPQ kinetics are fitted best with a sum of two functions: a sigmoidal Hill function plus a transient logarithmic normal function. It is shown that not only steady-state level of NPQ, but also the speed at which steady state is reached, increased with light intensity. The question is raised which biological processes cause the induction of the components of NPQ kinetics. The NPQ kinetics are found to resemble the kinetics of antheraxanthin and zeaxanthin formation during a dark to light transition. Furthermore, both molecules are known to induce NPQ. The hypothesis is put forward that a transient phase of NPQ (0-2 min after transition) is dependent upon concentrations of antheraxanthin, whereas the saturating phase corresponds with the production of zeaxanthin. A mathematical model, based on the presented hypothesis, predicts the effect of increasing light intensity on concentrations of antheraxanthin and zeaxanthin which correspond with experimental results. Implications of the hypothesis are discussed as well as the role of NLR in evaluating chlorophyll a fluorescence kinetics.
David D'Haese; Karine Vandermeiren; Roland Julien Caubergs; Yves Guisez; Ludwig De Temmerman; Nele Horemans
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of theoretical biology     Volume:  227     ISSN:  0022-5193     ISO Abbreviation:  J. Theor. Biol.     Publication Date:  2004 Mar 
Date Detail:
Created Date:  2004-03-01     Completed Date:  2004-06-04     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0376342     Medline TA:  J Theor Biol     Country:  England    
Other Details:
Languages:  eng     Pagination:  175-86     Citation Subset:  IM    
Department of Biology, University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerp, Belgium.
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MeSH Terms
Adaptation, Ocular*
Chlorophyll / chemistry*
Models, Biological
Regression Analysis
Trifolium / physiology*
Xanthophylls / metabolism*
beta Carotene / analogs & derivatives,  metabolism*
Reg. No./Substance:
0/Xanthophylls; 1406-65-1/Chlorophyll; 144-68-3/zeaxanthin; 479-61-8/chlorophyll a; 640-03-9/antheraxanthin; 7235-40-7/beta Carotene

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