Energy distribution in the photochemical apparatus of Porphyridium
cruentum: Picosecond fluorescence spectroscopy of cells in state 1 and state 2 at 77 K |
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| Authors: | Doug Bruce Cheryl A Hanzlik Lucia E Hancock John Biggins Robert S Knox |
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| Institution: | (1) Division of Biology and Medicine, Brown University, 02912 Providence, R.I.;(2) Department of Physics and Astronomy, University of Rochester, 14627 Rochester, N.Y.;(3) Laboratory for Laser Energetics, University of Rochester, 14627 Rochester, N.Y. |
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| Abstract: | Excitation energy distribution in Porphyridium
cruentum in state 1 and state 2 was investigated by time resolved 77 K fluorescence emission spectroscopy. The fluorescence rise times of phycoerythrin, phycocyanin and allophycocyanin (in cells in state 1 and state 2) were very similar in contrast to the emission from chlorophyll a (Chl a) associated with the two photosystems. In state 2 photosystem II (PSII) Chl a fluorescence emission rose faster than the PSI Chl a emission and decayed more rapidly, and the converse was observed in state 1. These kinetic data support the concept of increased energy transfer from PSII Chl a to PSI Chl a in state 2 in P.
cruentum.Abbreviations APC
allophycocyanin
- Chl a
chlorophyll a
- PSII
photosystem II
- PC
phycocyanin
- PE
phycoerythrin |
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| Keywords: | energy transfer fluorescence kinetics photosynthesis Porphyridium
cruentum spillover state transitions |
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