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PHOTOSYNTHETIC ENERGY TRANSFER REVERSIBLY INHIBITED BY HYDROSTATIC PRESSURE*
Author(s) -
Schreiber Ulrich,
Vidaver William
Publication year - 1973
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1973.tb06413.x
Subject(s) - hydrostatic pressure , thylakoid , fluorescence , phycocyanin , biophysics , chemistry , phycoerythrin , photochemistry , photosynthesis , phycobilisome , chloroplast , chlorophyll a , energy transfer , photosystem ii , cyanobacteria , biochemistry , biology , chemical physics , optics , physics , genetics , flow cytometry , bacteria , gene , thermodynamics
— Hydrostatic pressure is found to affect reversibly the emission spectra of Porphyra perforata. At 1200atm phycoerythrin and phycocyanin fluorescence show a remarkable increase, whereas at the same time chlorophyll a (Chl a ) fluorescence decreases. Upon release of pressure the fluorescence intensities of the individual pigments return to their original levels. This effect indicates that hydrostatic pressure acts as a unique reversible inhibitor of energy transfer between phycobilins and Chi a in the chloroplast. The effects of pressure and its release are relatively slow (minutes). It is suggested that pressure changes thylakoid membrane structure sufficiently to alter the critical distance between the phycobilisomes and Chl a , thus blocking the inductive resonance transfer of excitation energy.