Document Detail

Analysis of initial chlorophyll fluorescence induction kinetics in chloroplasts in terms of rate constants of donor side quenching release and electron trapping in photosystem II.
MedLine Citation:
PMID:  18197465     Owner:  NLM     Status:  MEDLINE    
The fluorescence induction F(t) of dark-adapted chloroplasts has been studied in multi-turnover 1 s light flashes (MTFs). A theoretical expression for the initial fluorescence rise is derived from a set of rate equations that describes the sequence of transfer steps associated with the reduction of the primary quinone acceptor Q (A) and the release of photochemical fluorescence quenching of photosystem II (PSII). The initial F(t) rise in the hundreds of mus time range is shown to follow the theoretical function dictated by the rate constants of light excitation (k (L)) and release of donor side quenching (k ( si )). The bi-exponential function shows sigmoidicity when one of the two rate constants differs by less than one order of magnitude from the other. It is shown, in agreement with the theory, that the sigmoidicity of the fluorescence rise is variable with light intensity and mainly, if not exclusively, determined by the ratio between rate of light excitation and the rate constant of donor side quenching release.
Wim J Vredenberg
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Publication Detail:
Type:  Journal Article     Date:  2008-01-15
Journal Detail:
Title:  Photosynthesis research     Volume:  96     ISSN:  0166-8595     ISO Abbreviation:  Photosyn. Res.     Publication Date:  2008 Apr 
Date Detail:
Created Date:  2008-02-25     Completed Date:  2008-07-21     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100954728     Medline TA:  Photosynth Res     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  83-97     Citation Subset:  IM    
Department of Plant Physiology, Wageningen University and Research (WUR), Arboretumlaan 4, 6703 BD Wageningen, The Netherlands.
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MeSH Terms
Chlorophyll / chemistry,  metabolism*
Chloroplasts / metabolism*
Electron Transport
Photosystem II Protein Complex / metabolism*
Reg. No./Substance:
0/Photosystem II Protein Complex; 1406-65-1/Chlorophyll

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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