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PICOSECOND TIME‐RESOLVED EMISSION SPECTRA OF PHOTOINHIBITED AND PHOTOBLEACHED Anabaena variabilis
Author(s) -
Bittersmann E.,
Holzwarth A. R.,
Agel G.,
Nultsch W.
Publication year - 1988
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.1751-1097.1988.tb02700.x
Subject(s) - anabaena variabilis , photobleaching , phycobilisome , photoinhibition , picosecond , fluorescence , chemistry , photochemistry , pigment , optics , photosynthesis , physics , biology , laser , photosystem ii , cyanobacteria , organic chemistry , biochemistry , genetics , bacteria
— Time resolved emission spectra have been measured of Anabaena variabilis cells which were grown under different light conditions. The spectra of algae photoinhibited with strong white light for 6 h as well as of algae irradiated with blue light are similar to those of the control (weak white light). Cells that were photobleached with strong white light or red light (5 days each) show dramatic changes in their time resolved emission spectra. The contributions of long‐lived components to the time resolved emission spectra are large in photobleached cells. In both the reference sample and in photoinhibited cells the short‐lived components with lifetimes in the picosecond range prevail which indicates efficient energy transfer within the antenna pigments. The results upon photobleaching are discussed in terms of a functional decoupling of the phycobilisome rods from the core while photoinhibition does not influence the pigment composition and the molecular organization of the antenna pigments.