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Quantitative analysis of 77K fluorescence emission spectra in Synechocystis sp. PCC 6714 and Chlamydomonas reinhardtii with variable PS I/PS II stoichiometries

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Abstract

Low-temperature (77 K) fluorescence emission spectra of intact cells of a cyanobacterium, Synechocystis sp. PCC 6714, and a green alga, Chlamydomonas reinhardtii, were quantitatively analyzed to examine differences in PS I/PS II stoichiometries. Cells cultured under different spectral conditions had various PS I/PS II molar ratios when estimated by oxidation-reduction difference absorption spectra of P700 (for PS I) and Cyt b-559 (for PS II) with thylakoid membranes. The fluorescence emission spectra under the Chl a excitation at 435 nm were resolved into several component bands using curve-fitting methods and the relative band area between PS II (F685 and F695) and PS I (F710 or F720) emissions was compared with the PS I/PS II stoichiometries of the various cell types. The results indicated that the PS I/PS II fluorescence ratios correlated closely with photosystem stoichiometries both in Synechocystis sp. PCC 6714 and in C. reinhardtii grown under different light regimes. Furthermore, the correlation between the PS I/PS II fluorescence ratios and the photosystem stoichiometries is also applicable to vascular plants.

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Murakami, A. Quantitative analysis of 77K fluorescence emission spectra in Synechocystis sp. PCC 6714 and Chlamydomonas reinhardtii with variable PS I/PS II stoichiometries. Photosynthesis Research 53, 141–148 (1997). https://doi.org/10.1023/A:1005818317797

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