期刊
BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS
卷 1787, 期 10, 页码 1170-1178出版社
ELSEVIER
DOI: 10.1016/j.bbabio.2009.04.013
关键词
Fluorescence induction; Cyanobacterium; PCC 7942; Phycobilisome; State transition
资金
- University of Illinois at Urbana-Champaign
- GAN [206/09/094]
- GACR [206/07/0917]
- GAAV [A608170603]
- Institutional Research Concepts [AVOZ50200510, MSM6007665808]
We present here three-dimensional time-wavelength-intensity displays of changes in variable fluorescence, during the O(JI)PSMT transient, observed in cyanobacterium at room temperature. We were able to measure contributions of individual chromophores to fluorescence spectra at various times of fluorescence induction (FI). The method was applied to a freshwater cyanobacterium, Synechococcus sp. (PCC 7942). Analysis of our experimental results provides the following new conclusions: (i) the main chlorophyll (Chl) a emission band at similar to 685 nm that originates in Photosystem (PS) 11 exhibits typical fast (OPS) and slow (SMT) FI kinetics with both orange (622 nm) and blue (464 nm) excitation. (ii) Similar kinetics are exhibited for its far-red emission satellite band centered at similar to 745 nm, where the PS 11 contribution predominates. (iii) A significant OPS-SMT-type kinetics of C-phycocyanin emission at similar to 650 nm are observed with the blue light excitation, but not with orange light excitation where the signal rose only slightly to a maximum. The induction of F650 was not caused by an admixture of the F685 fluorescence and thus our data show light-inducible and dark-reversible changes of phycobilin fluorescence in vivo. We discuss possible interpretations of this new observation. (C) 2009 Elsevier B.V. All rights reserved.d
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