In this work, we have developed a mathematical model for the description of electron and proton transport processes which takes into account the diffusion of plastoquinol, plastocyanine and hydrogen ions in laterally heterogeneous thylakoid system of chloroplasts. Chloroplasts were considered as a coaxial system of granal and stromal thylakoids with the non-uniform distribution of photosystem I and photosystem 2 complexes in the membranes of stromal and granal thylakoids. The model also takes into account the processes of hydrogen ion diffusion along the outer and inner surfaces of the thylakoid membrane, their interaction with the membrane-bound proton-accepting groups, a transmembrane proton transport. Within the framework of this model, we have simulated the influence of the intensity and spectral composition of actinic light on the electron and proton transport processes. Results of numerical experiments were compared with the experimental data taken from literature. It was demonstrated that the buffer capacity of thylakoid membranes markedly influences the kinetics of the light-induced redox transients of electron carriers and pH inside the thylakoids and in the interthylakoid gap.
|Number of pages||9|
|Publication status||Published - May 31 2003|
ASJC Scopus subject areas
- Molecular Biology
- Cell Biology