While several studies have observed modulated bacteriochlorophyll fluorescence in anoxygenic photosynthetic bacteria, there has been little evidence to support a link between this variable fluorescence and a regulatory mechanism that controls the flow of energy between antenna complexes and reaction centers.  In this study, steady state and time-resolved spectroscopic methods are used to monitor the fluorescence from the antenna complexes of the green sulfur bacterium Chlorobaculum tepidum.  The dependence of this fluorescence is explored as a function of the three substrates of this photosynthetic system:  reduced sulfur compounds, light, and CO2.  It is found that the variable fluorescence behavior observed at any given condition and the differences in behavior observed as substrate levels are varied are consistent with a mechanism that alters the flow of energy to the reaction center in response to the availability of downstream acceptors.

Substrate dependence of the variable fluorescence from <i>Chlorobaculum tepidum</i> photosynthetic antenna complexes

243rd National Meeting (2012)

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Substrate dependence of the variable fluorescence from Chlorobaculum tepidum photosynthetic antenna complexes