Excitation spectra for photosystem I and photosystem II in chloroplasts and the spectral characteristics of the distributions of quanta between the two photosystems.

Biochimica Et Biophysica Acta
M Kitajima, W L Butler

Abstract

The parameters listed in the title were determined within the context of a model for the photochemical apparatus of photosynthesis. The fluorescence of variable yield at 750 nm at -196 degrees C is due to energy transfer from Photosystem II to Photosystem I. Fluorescence excitation spectra were measured at -196 degrees C at the minimum, FO, level and the maximum, FM, level of the emission at 750 nm. The difference spectrum, FM-FO, which represents the excitation spectrum for FV is presented as a pure Photosystem II excitation spectrum. This spectrum shows a maximum at 677 nm, attributable to the antenna chlorophyll a of Photosystem II units, with a shoulder at 670 nm and a smaller maximum at 650 nm, presumably due to chlorophyll a and chlorophyll b of the light-harvesting chlorophyll complex. Fluoresence at the FO level at 750 nm can be considered in two parts; one part due to the fraction of absorbed quanta, alpha, which excites Photosystem I more-or-less directly and another part due to energy transfer from Photosystem II to Photosystem I. The latter contribution can be estimated from the ratio of FO/FV measured at 692 nm and the extent of FV at 750 nm. According to this procedure the excitation spectrum of Photosystem I at -...Continue Reading

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Citations

Apr 1, 1989·Photosynthesis Research·J Biggins, D Bruce
Sep 29, 2009·Photosynthesis Research·Zuzana Benediktyová, Ladislav Nedbal
Jun 25, 2013·Photosynthesis Research·Alexandrina Stirbet
Sep 18, 2013·Photosynthesis Research·Merope Tsimilli-Michael, Reto J Strasser
Nov 1, 1976·Proceedings of the National Academy of Sciences of the United States of America·A C Ley, W L Butler
Aug 1, 1977·Proceedings of the National Academy of Sciences of the United States of America·W L Butler, R J Strasser
Jun 10, 2014·Biochemistry. Biokhimii︠a︡·A Stirbet Govindjee
Mar 21, 2016·Photosynthesis Research·Alexandrina Stirbet, Govindjee
Apr 4, 2008·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·Roberto PedrósStéphane Jacquemoud
May 29, 2014·Journal of Experimental Botany·Albert Porcar-CastellJoseph A Berry
Nov 3, 2005·Journal of Experimental Botany·Chenghong HuangLixin Zhang
Sep 10, 2019·PeerJ·Oksana Y ShtarkMaria F Shishova

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