Abstract
Theoretical modelling is often overlooked in photosynthesis research even if it can significantly help with understanding of explored system. A new model of light-induced photosynthetic reactions occurring in and around thylakoid membrane is introduced here and used for theoretical modelling of not only the light-induced chlorophyll (Chl) a fluorescence rise (FLR; the O-J-I-P transient), reflecting function of photosystem II (PSII), but also of the 820 nmtransmittance signal (I820), reflecting function of photosystem I (PSI) and plastocyanin (PC), paralleling the FLR. Correctness of the model was verified by successful simulations of the FLR and I820 signal as measured with the control (no treatment) sample but also as measured with 2,5-dibromo-3-methyl-6-isopropyl-p-benzoquinone- (inhibits electron transport in cytochrome b 6/f) and methylviologen- (accepts electrons from iron-sulphur cluster of PSI) treated samples and with the control sample upon different intensities of excitation light. From the simulations performed for the control sample, contribution of the oxidised donor of PSI, P700, and oxidised PC to the I820 signal minimum (reflects maximal accumulations of the two components) was estimated to be 75% and 25%, respectively. Further in silico experiments showed that PC must be reduced in the dark, cyclic electron transport around PSI must be considered in the model and activation of ferredoxin-NADP+-oxidoreductase (FNR) also affects the FLR. Correct simulations of the FLR and I820 signal demonstrate robustness of the model, confirm that the electron transport reactions occurring beyond PSII affect the shape of the FLR, and show usefulness and perspective of theoretical approach in studying of the light-induced photosynthetic reactions.
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Abbreviations
- bH or H:
-
high potential haem b of cyt b 6/f
- bL or L:
-
low potential haem b of cyt b 6/f
- c or C:
-
haem c of cyt b 6/f
- CET:
-
cyclic electron transport
- Chl:
-
chlorophyll
- cyt:
-
cytochrome
- DBMIB:
-
2,5-dibromo-3-methyl-6-isopropyl-p-benzoquinone
- F:
-
haem f of cyt b 6/f
- F0 :
-
minimal fluorescence
- FB or X:
-
iron-sulphur cluster of PSI
- FM :
-
maximal fluorescence
- Fd:
-
ferredoxin
- FLD:
-
fluorescence decrease
- FLI:
-
fluorescence induction
- FLR:
-
fluorescence rise
- FNR:
-
ferredoxin-NADP+-oxidoreductase
- I820 :
-
relative transmittance signal measured at 820 nm
- MV:
-
1,1′dimethyl-4,4′-bipyridinium-dichloride (methylviologen)
- NADP+ and NADPH:
-
oxidised and reduced nicotinamide adenine dinucleotide phosphate
- O, K, J, I, P, G, H:
-
particular steps of the FLR
- OEC:
-
oxygen evolving complex
- P680 or P:
-
electron donor of PSII
- P700 or R:
-
electron donor of PSI
- PC:
-
plastocyanin
- PQ and PQH2 :
-
oxidised and reduced plastoquinone
- PSI:
-
photosystem I
- PSII:
-
photosystem II
- QA or A:
-
first quinone electron acceptor of PSII
- QB or B:
-
second quinone electron acceptor of PSII
- RCII:
-
reaction centre of PSII
- RT:
-
room temperature
- Si (i = 0, 1, 2, 3):
-
redox states of OEC
- TM:
-
thylakoid membrane
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Acknowledgements
This work was supported by the Ministry of Education of the Czech Republic by a grant number MSM 6198959215 and through the Marie Curie Initial Training Network of the 7th Framework Programme of the European Union, contract number PITN-GA-2009-238017. The experimental data presented in Fig. 1 are courtesy of Gert Schansker and Petr Ilík.
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Lazár, D. Modelling of light-induced chlorophyll a fluorescence rise (O-J-I-P transient) and changes in 820 nm-transmittance signal of photosynthesis. Photosynthetica 47, 483–498 (2009). https://doi.org/10.1007/s11099-009-0074-8
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DOI: https://doi.org/10.1007/s11099-009-0074-8