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Computer simulation study of pH-dependent regulation of electron transport in chloroplasts

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Abstract

A mathematical model is presented that describes the key steps of photosynthetic electron transport and transmembrane proton transfer in chloroplasts. Numerical modeling has been performed with due regard for regulatory processes at the donor and acceptor parts of photosystem (PS) I. The influence of pH-dependent activation of the Calvin cycle enzymes and energy dissipation in PS II (nonphotochemical quenching of chlorophyll fluorescence) on the light-induced redox transients of P700, plastoquinone, and NADP as well as on the changes in intrathylakoid pH and ATP level is examined. It is demonstrated that pH-dependent regulatory processes alter the distribution of electron fluxes on the acceptor side of PS I and the total rate of electron flow between PS II and PS I. The light-induced activation of the Calvin cycle leads to significant enhancement of the electron flow from PS I to NADP+ and attenuation of the electron flow to molecular oxygen.

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Abbreviations

CC:

Calvin cycle

ETC:

electron transport chain

Fd:

ferredoxin

FQR:

ferredoxin:quinone reductase

FNR:

ferredoxin:NADP reductase

NPQ:

nonphotochemical quenching

PS:

photosystem

SIF:

slow induction of fluorescence

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Authors and Affiliations

  1. Physical Faculty, Moscow State University, Moscow, 119992, Russia

    I. V. Kuvykin, A. V. Vershubskii, V. I. Priklonskii & A. N. Tikhonov

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  1. I. V. Kuvykin
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  2. A. V. Vershubskii
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  3. V. I. Priklonskii
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  4. A. N. Tikhonov
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Correspondence to A. N. Tikhonov.

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Original Russian Text © I.V. Kuvykin, A.V. Vershubskii, V.I. Priklonskii, A.N. Tikhonov, 2009, published in Biofizika, 2009, Vol. 54, No. 4, pp. 647–659.

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Kuvykin, I.V., Vershubskii, A.V., Priklonskii, V.I. et al. Computer simulation study of pH-dependent regulation of electron transport in chloroplasts. BIOPHYSICS 54, 455–464 (2009). https://doi.org/10.1134/S0006350909040101

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