NDLI: 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

Content Provider	Springer Nature Link
Author	Vredenberg, Wim J.
Copyright Year	2008
Abstract	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 μs 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.
Starting Page	83
Ending Page	97
Page Count	15
File Format	PDF
ISSN	01668595
Journal	Photosynthesis Research
Volume Number	96
Issue Number	1
e-ISSN	15735079
Language	English
Publisher	Springer Netherlands
Publisher Date	2008-01-15
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Photosystem II Chlorophyll fluorescence induction Donor side quenching Sigmoidicity Intersystem energy transfer Plant Physiology
Content Type	Text
Resource Type	Article
Subject	Cell Biology Plant Science Medicine Biochemistry

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