Abstract
Equations for fluorescence and the rates of photochemistry of photosystem I and photosystem II are derived from a photochemical model for the photosynthetic apparatus that includes the various interactions of the light-harvesting chlorophyll a/b complex with photosystem I and photosystem II as specific photochemical rate constants. The degree of coupling between photosystem II and the chlorophyll a/b complex which is expressed as a product of two probability terms plays a central role in this three-pigment system. The cycling of excitation energy back and forth between photosystem II and the chlorophyll a/b complex increases the exciton density in both arrays of chlorophyll according to a simple analytical expression in the equations. These equations of the tripartite model provide new and credible insights into the photochemical apparatus of photosynthesis.
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Selected References
These references are in PubMed. This may not be the complete list of references from this article.
- Arntzen C. J., Ditto C. L. Effects of cations upon chloroplast membrane subunit. Interactions and excitation energy distribution. Biochim Biophys Acta. 1976 Nov 9;449(2):259–274. doi: 10.1016/0005-2728(76)90138-9. [DOI] [PubMed] [Google Scholar]
- Butler W. L., Kitajima M. Energy transfer between photosystem II and photosystem I in chloroplasts. Biochim Biophys Acta. 1975 Jul 8;396(1):72–85. doi: 10.1016/0005-2728(75)90190-5. [DOI] [PubMed] [Google Scholar]
- Butler W. L., Kitajima M. Fluorescence quenching in photosystem II of chloroplasts. Biochim Biophys Acta. 1975 Jan 31;376(1):116–125. doi: 10.1016/0005-2728(75)90210-8. [DOI] [PubMed] [Google Scholar]
- Homann P. H. Cation effects on the fluorescence of isolated chloroplasts. Plant Physiol. 1969 Jun;44(6):932–936. doi: 10.1104/pp.44.6.932. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Joliot P., Bennoun P., Joliot A. New evidence supporting energy transfer between photosynthetic units. Biochim Biophys Acta. 1973 May 30;305(2):317–328. doi: 10.1016/0005-2728(73)90179-5. [DOI] [PubMed] [Google Scholar]
- Kitajima M., Butler W. L. Excitation spectra for photosystem I and photosystem II in chloroplasts and the spectral characteristics of the distributions of quanta between the two photosystems. Biochim Biophys Acta. 1975 Dec 11;408(3):297–305. doi: 10.1016/0005-2728(75)90131-0. [DOI] [PubMed] [Google Scholar]
- Murata N. Control of excitation transfer in photosynthesis. II. Magnesium ion-dependent distribution of excitation energy between two pigment systems in spinach chloroplasts. Biochim Biophys Acta. 1969 Oct 21;189(2):171–181. doi: 10.1016/0005-2728(69)90045-0. [DOI] [PubMed] [Google Scholar]
- Thornber J. P., Highkin H. R. Composition of the photosynthetic apparatus of normal barley leaves and a mutant lacking chlorophyll b. Eur J Biochem. 1974 Jan 3;41(1):109–116. doi: 10.1111/j.1432-1033.1974.tb03250.x. [DOI] [PubMed] [Google Scholar]
- Wessels J. S., van Alphen-Van Waveren, Voorn G. Isolation and properties of particles containing the reaction center complex of photosystem II from spinach chloroplasts. Biochim Biophys Acta. 1973 Apr 5;292(3):741–752. doi: 10.1016/0005-2728(73)90021-2. [DOI] [PubMed] [Google Scholar]