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Effects of desiccation on the excitation energy distribution from phyco erythrin to the 2 photosystems in the red alga porphyra perforata



Effects of desiccation on the excitation energy distribution from phyco erythrin to the 2 photosystems in the red alga porphyra perforata



Physiologia Plantarum 56(1): 56-62



Low temperature (77.degree. K) fluorescence emission and excitation spectra were recorded for wet and desiccated thalli of P. perforata. The photosystem [PS] I (F730) and PS II (F695) fluorescence emission kinetics during PS II trap closure were also recorded at 77.degree. K. Desiccation induced a lowering of the fluorescence yield over the whole emission spectrum, but the decrease was most pronounced for the PS II fluorescence bands, F688 and F695. The desiccation-induced changes of the phycoerythrin-sensitized emission spectrum were due to a decrease in the fluorescence yield of the PS I antenna, an even stronger decrease in the fluorescence of PS II, which was mediated by an increased spillover (kT(II .fwdarw. I)) of excitation to PS I and an increase in the absorption cross section, .alpha., for PS I. Apparently, the increase of both kT(II .fwdarw. I) and .alpha. may be part of a mechanism by which the desiccation-tolerant, high light exposed, Porphyra can avoid photodynamic damage to PS II, when photosynthesis becomes inhibited as a result of desiccation during periods of low tide.

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Accession: 005298739

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