On the approaches applied in formulation of a kinetic model of photosystem II: Different approaches lead to different simulations of the chlorophyll a fluorescence transients

Lazár, Dušan; Jablonský, Jiří

doi:10.1016/j.jtbi.2008.11.018

Cited by 45 publications

(20 citation statements)

References 30 publications

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“…The appearance of this point on the ChlF induction curve may be associated with electron transport inhibition between the OEC and the PSII reaction center Wu et al 2008). Models of Pb stress suggest that energy absorption and dissipation within the PSII are high, while electron trapping and transport are reduced (Lazár and Jablonský 2009). …”

Section: Heavy Metal Stressmentioning

confidence: 99%

Chlorophyll a fluorescence as a tool to monitor physiological status of plants under abiotic stress conditions

et al. 2016

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Plants living under natural conditions are exposed to many adverse factors that interfere with the photosynthetic process, leading to declines in growth, development, and yield. The recent development of Chlorophyll a fluorescence (ChlF) represents a potentially valuable new approach to study the photochemical efficiency of leaves. Specifically, the analysis of fluorescence signals provides detailed information on the status and function of Photosystem II (PSII) reaction centers, lightharvesting antenna complexes, and both the donor and acceptor sides of PSII. Here, we review the results of fast ChlF analyses of photosynthetic responses to environmental stresses, and discuss the potential scientific and practical applications of this innovative methodology. The recent availability of portable devices has significantly expanded the potential utilization of ChlF techniques, especially for the purposes of crop phenotyping and monitoring.

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Section: Heavy Metal Stressmentioning

confidence: 99%

Chlorophyll a fluorescence as a tool to monitor physiological status of plants under abiotic stress conditions

et al. 2016

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“…Different solutions have been offered in order to improve the simulation of the J-I-P phase (i.e., the thermal phase) with TEG models (see Lazár and Jablonsky (2009) for a methodological approach in mathematical simulation of the O-J-I-P transient). We list below several of these approaches:…”

Section: Alernatives To the Modified Version Of Duysens And Sweers Thmentioning

confidence: 99%

Chlorophyll a fluorescence induction: a personal perspective of the thermal phase, the J–I–P rise

2012

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“…The exchange was described by reversible second order reaction with forward and backward rate constants k f B and k b B , respectively. In the model of PSII reactions, for simplicity OEC was assumed as a separate part which results in existence of 12 model forms (also called state variables) describing the redox state of PSII (see Scheme A1) instead of 64 model forms (Lazár and Jablonský 2009). The virtual separation of OEC from PSII, however, might be correct for description of OEC function .…”

Section: Model Reactionsmentioning

confidence: 99%

“…Also because of simplicity, the exchange of Q B 2-with PQ molecule from the pool was described by one second order reaction (e.g., P680 + Q A Q B 2-+ PQ ↔ P680 + Q A Q B + PQH 2 ) and not by two subsequent reactions (e.g., P680 + Q A Q B 2-↔ P680 + Q A E + PQH 2 followed by P680 + Q A E + PQ ↔ P680 + Q A Q B , where E stands for empty Q B -pocket in PSII). If the latter approach was applied, 16 instead of 12 redox forms would describe the redox state of PSII but this approach does not cause any new effect on the shape of the FLR (Lazár and Jablonský 2009). Moreover, application of the later approach to all related reactions (all reactions involving PQ, PC and Fd) would lead to enormous increase of dimension of the model.…”

Section: Model Reactionsmentioning

confidence: 99%

Modelling of light-induced chlorophyll a fluorescence rise (O-J-I-P transient) and changes in 820 nm-transmittance signal of photosynthesis

Lazár¹

2009

Photosynt.

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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 (I 820 ), 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 I 820 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 I 820 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 I 820 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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On the approaches applied in formulation of a kinetic model of photosystem II: Different approaches lead to different simulations of the chlorophyll a fluorescence transients

Cited by 45 publications

References 30 publications

Chlorophyll a fluorescence as a tool to monitor physiological status of plants under abiotic stress conditions

Chlorophyll a fluorescence as a tool to monitor physiological status of plants under abiotic stress conditions

Chlorophyll a fluorescence induction: a personal perspective of the thermal phase, the J–I–P rise

Modelling of light-induced chlorophyll a fluorescence rise (O-J-I-P transient) and changes in 820 nm-transmittance signal of photosynthesis

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