Abstract
The set up described in Steffen et al. (Biochemistry 40:173–180, 2001) was used to monitor in the time domain from 100 ns to 10 s single turnover flash-induced transients of the normalized fluorescence yield (SFITFY) on dark-adapted cells of the thermophilic algae Chlorella pyrenoidosa Chick. Perfect data fit was achieved within the framework of a previously proposed model for the PS II reaction pattern (Lebedeva et al., Biophysics 47:968–980, 2002; Belyaeva et al., Biophysics 51:860–872, 2006) after its modification by taking into account nonradiative decay processes including nonphotochemical quenching due to time-dependent populations of P680+• and 3Car. On the basis of data reported in the literature, a consistent set of rate constants was obtained for electron transfer at the donor and acceptor sides of PS II, pH in lumen and stroma, the initial redox state of plastoquinone pool and the rate of plastoquinone oxidation. The evaluation of the rate constant values of dissipative processes due to quenching by carotenoid triplets in antennae and P680+•QA −• recombination as well as the initial state populations after excitation with a single laser flash are close to that outlined in (Steffen et al., Biochemistry 44:3123–3133, 2005a). The simulations based on the model of the PS II reaction pattern provide information on the time courses of population probabilities of different PS II states. We analyzed the maximum (\( F_{\text{m}}^{\text{STF}} \)) and minimum (F 0) of the normalized FL yield dependence on the rate of the recombination processes (radiative and dissipative nonradiative) and of P680+• reduction. The developed PS II model provides a basis for theoretical comparative analyses of time-dependent fluorescence signals, observed at different photosynthetic samples under various conditions (e.g. presence of herbicides, other stress conditions, excitation with actinic pulses of different intensity, and duration).
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Abbreviations
- Chl:
-
Chlorophyll
- PS II:
-
Photosystem II
- RC:
-
Reaction center of PS II
- P680:
-
Photoactive pigment of the RC of PS II
- Phe:
-
Primary electron acceptor pheophytin
- QA and QB :
-
Primary and secondary quinone electron acceptors of PS II
- 3Car:
-
Triplet carotenoid states
- WOC:
-
Water-oxidizing complex
- PQ:
-
Plastoquinone
- PQH2 :
-
Plastoquinol
- HL + :
-
Protons in lumen
- HS + :
-
Protons in stroma
- YZ :
-
Tyrosine 161 of the PS II D1 polypeptide
- S i :
-
Redox states of the WOC
- ΔΨ:
-
Electric potential across the thylakoid membrane
- ET:
-
Electron transfer
- FL, FL(t):
-
Fluorescence
- k L :
-
Rate constant of light excitation
- \( k_{{{\text{P}}680^{ + } }} ,\;k_{{3_{\text{Car}} }} \) :
-
Rate constants of quenching: by cation radical P680+• by triplet carotenoids
- k F :
-
Rate constant of fluorescence emission
- k HD :
-
Rate constant of heat dissipation of Chl excitation
- k Z :
-
Rate constant of the electron donation to the oxidized P680+•
- k CL :
-
Rate constant of the charge separation for closed RCs
- LED:
-
Light-emitting diode
- SFITFY:
-
Single flash-induced transient of fluorescence yield
- PPFD:
-
Photosynthetic photon flux density
- \( F_{0} ,F_{\text{m}}^{\text{STF}} \) :
-
Minimal maximal FL yield
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Acknowledgments
We are grateful to Prof. A. A. Bulychev for the fruitful discussions, Dr. O. V. Demin for DBsolve software: version 7.01 (demin@genebee.msu.su). This work was supported by the Russian Foundation for Basic Research, project nos. 07-04-00375, 05-04-48912, 08-04-01112, by the International Bureau of BMBF, Germany, project RUS 06/003, and by Deutsche Forschungsgemeinschaft (SfB 429).
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Belyaeva, N.E., Schmitt, FJ., Steffen, R. et al. PS II model-based simulations of single turnover flash-induced transients of fluorescence yield monitored within the time domain of 100 ns–10 s on dark-adapted Chlorella pyrenoidosa cells. Photosynth Res 98, 105–119 (2008). https://doi.org/10.1007/s11120-008-9374-2
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DOI: https://doi.org/10.1007/s11120-008-9374-2