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INCREASED ENERGY TRANSFER FROM PHYCOBILISOMES TO PHOTOSYSTEM II IN HIGH LIGHT ADAPTED Anabaena cylindrica
Author(s) -
Laczkó Ilona,
Kaiseva Elizabeth
Publication year - 1987
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.1751-1097.1987.tb04789.x
Subject(s) - phycobilisome , allophycocyanin , photosystem ii , photosystem i , fluorescence , photochemistry , biophysics , photosynthesis , photosystem , thylakoid , anabaena variabilis , chemistry , chloroplast , biology , cyanobacteria , botany , phycocyanin , biochemistry , optics , physics , genetics , bacteria , gene
Excitation energy transfer from phycobilisomes to photosystem II in high‐light adapted cells of Anabaena cylindrica was studied by fluorescence spectroscopy and compared to that of low‐light adapted cells. Measurements were made on membrane fragments containing phycobilisomes, photosystem I and II, isolated in 0.75 M K‐phosphate. Relative efficiency of 430 to 590 nm light in the excitation of F 680 chlorophyll fluorescence was compared in low and high light adapted cells, respectively. The values indicate that light energy absorbed by phycobilisomes is transferred to photosystem II antenna chlorophylls with higher efficiency in high‐light adapted cells than in low‐light adapted cells. Partial dissociation and uncoupling of energy transfer caused by low ion concentration were different in the membrane fragments isolated from the two kinds of cells and indicated a higher aggregation state of pigment‐protein complexes of phycobilisomes in high‐light adapted A. cylindrica cells.