Up-converted fluorescence from photosynthetic light-harvesting complexes linearly dependent on excitation intensity

Weak up-converted fluorescence related to bacteriochlorophyll  a was recorded from various detergent-isolated and membrane-embedded light-harvesting pigment–protein complexes as well as from the functional membranes of photosynthetic purple bacteria under continuous-wave infrared laser excitation at...

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Bibliographic Details
Published in:Photosynthesis research 2016, Vol.127 (1), p.77-87
Main Authors: Leiger, Kristjan, Freiberg, Arvi
Format: Article
Language:English
Subjects:
Atoms & subatomic particles
Bacteria
Bacteriochlorophyll A - chemistry
Bacteriochlorophyll A - metabolism
Biochemistry
Biomedical and Life Sciences
Carotenoids - chemistry
Carotenoids - metabolism
Cells
Chromophores
Ferricyanides - chemistry
Fluorescence
Lasers
Life Sciences
Light
Light-Harvesting Protein Complexes - chemistry
Light-Harvesting Protein Complexes - metabolism
Photons
Photosynthesis
Plant Genetics and Genomics
Plant Physiology
Plant Sciences
Regular Paper
Rhodobacter sphaeroides - chemistry
Spectrometry, Fluorescence
Spectrum analysis
Temperature
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Summary:Weak up-converted fluorescence related to bacteriochlorophyll  a was recorded from various detergent-isolated and membrane-embedded light-harvesting pigment–protein complexes as well as from the functional membranes of photosynthetic purple bacteria under continuous-wave infrared laser excitation at 1064 nm, far outside the optically allowed singlet absorption bands of the chromophore. The fluorescence increases linearly with the excitation power, distinguishing it from the previously observed two-photon excited fluorescence upon femtosecond pulse excitation. Possible mechanisms of this excitation are discussed.
ISSN:0166-8595
1573-5079
DOI:10.1007/s11120-015-0117-x