Abstract
Regulation of excited chlorophyll concentration in photosynthetic membranes occurs at the level of both light absorption and exciton-deactivation processes i.e.: photochemistry, fluorescence and internal conversion. In a dark adapted leaf, the yield of photochemistry is high; the quantum yield of linear electron flow through the two photosystems measured in dim light is close to 0.1 μmole O2 evolved per μEinstein absorbed. Therefore the quantum yield of charge separation and its stabilization in each photosystem reaches 0.8: (0.1×4e- ×2photosystems) indeed to evolve one O2 molecule, four electrons have to go through two photoreaction in series. When photochemistry is maximal, the PSII associated fluorescence yield is around 2.5%, reaching about 11% when the photochemistry is nil. The yield of PSI fluorescence is 0.5% and, in contrast to PSII fluorescence, it does not change with the extent of the photochemistry.
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© 1996 Plenum Press, New York
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Briantais, JM. (1996). Regulation of Excited States in Photosynthesis of Higher Plants. In: Jennings, R.C., Zucchelli, G., Ghetti, F., Colombetti, G. (eds) Light as an Energy Source and Information Carrier in Plant Physiology. NATO ASI Series, vol 287. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-0409-8_9
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