Journal
PHOTOSYNTHESIS RESEARCH
Volume 104, Issue 2-3, Pages 283-292Publisher
SPRINGER
DOI: 10.1007/s11120-010-9554-8
Keywords
Heliobacterium modesticaldum; Fluorescence modulation; Fluorescence induction
Categories
Funding
- NASA [NNX08AP62G]
- NSF [MCB-0347935]
- CNRS
- NASA [NNX08AP62G, 95251] Funding Source: Federal RePORTER
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In what appears to be a common theme for all phototrophs, heliobacteria exhibit complex modulations of fluorescence yield when illuminated with actinic light and probed on a time scale of mu s to minutes. The fluorescence yield from cells of Heliobacterium modesticaldum remained nearly constant for the first 10-100 ms of illumination and then rose to a maximum level with one or two inflections over the course of many seconds. Fluorescence then declined to a steady-state value within about one minute. In this analysis, the origins of the fluorescence induction in whole cells of heliobacteria are investigated by treating cells with a combination of electron accepters, donors, and inhibitors of the photosynthetic electron transport, as well as varying the temperature. We conclude that fluorescence modulation in H. modesticaldum results from acceptor-side limitation in the reaction center (RC), possibly due to charge recombination between P(800) (+) and A(0) (-).
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