期刊
PHOTOSYNTHESIS RESEARCH
卷 133, 期 1-3, 页码 103-114出版社
SPRINGER
DOI: 10.1007/s11120-017-0349-z
关键词
Chloroplasts; Electron transport; Proton potential; Interaction of electron transport complexes; Mathematical modeling
资金
- Russian Foundation for Basic Research (RFBR Project) [15-04-03790a]
In chloroplasts, photosynthetic electron transport complexes interact with each other via the mobile electron carriers (plastoquinone and plastocyanin) which are in surplus amounts with respect to photosystem I and photosystem II (PSI and PSII), and the cytochrome b (6) f complex. In this work, we analyze experimental data on the light-induced redox transients of photoreaction center P-700 in chloroplasts within the framework of our mathematical model. This analysis suggests that during the action of a strong actinic light, even significant attenuation of PSII [for instance, in the result of inhibition of a part of PSII complexes by DCMU or due to non-photochemical quenching (NPQ)] will not cause drastic shortage of electron flow through PSI. This can be explained by electronic and/or excitonic connectivity between different PSII units. At strong AL, the overall flux of electrons between PSII and PSI will maintain at a high level even with the attenuation of PSII activity, provided the rate-limiting step of electron transfer is beyond the stage of PQH(2) formation. Results of our study are briefly discussed in the context of NPQ-dependent mechanism of chloroplast protection against light stress.
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