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EXCITATION ENERGY TRANSFER IN THE CHROMATICALLY ADAPTED PHYCOBILIN SYSTEMS OF BLUE‐GREEN ALGAE: DIFFERENCE IN THE ENERGY TRANSFER KINETICS AT PHYCOCYANIN LEVEL
Author(s) -
Mimuro Mamoru,
Yamazaki Iwao,
Yamazaki Tomoko,
Fujita Yoshihiko
Publication year - 1985
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.1751-1097.1985.tb03532.x
Subject(s) - phycobilisome , allophycocyanin , phycocyanin , excited state , phycoerythrin , chromophore , chemistry , fluorescence , excitation , algae , kinetics , photochemistry , biophysics , botany , physics , cyanobacteria , biology , optics , microbiology and biotechnology , atomic physics , flow cytometry , genetics , quantum mechanics , bacteria
— Excitation energy transfer in chromatically adapted phycobilin system was investigated with the blue‐green algae Tolypothrix tenuis and, supplementary, Fremyella diplosiphon with use of time‐resolved fluorescence spectrum (Yamazaki et al , 1984). Special attention was paid to the energy migration at the phycocyanin (PC) level in the phycoerythrin (PE)‐rich and PE excited system and in the PE‐less and PC excited system. The energy transfer from PC to allophycocyanin was far faster in the former than in the latter in both organisms. Such feature was the same as our previous observation for PE‐rich system of Porphyridium cruentum and PE‐less system of Anacystis nidulans (Yamazaki et al , 1984). Thus, the difference in phycobilisome structure is not a cause for such difference. Based on simulation analysis, we interpreted our observation as that (1) all PC chtomophores do not equally participate to the energy migration within PC compartment but (2) a short transfer path through PC compartment is formed probably by f‐type chromophores and (3) the difference in the “length” of this path is a main determinant for kinetic difference between PE‐rich and PE‐less systems.