Gross primary production is a measure of the energy that a photoautotroph harvests from the sun.
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PCC7002 by Baran, " et al . " revealed that this photoautotroph could deplete a diverse pool of exogenous metabolites.
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A pure culture of a photosynthetic bacterium grew as a photoautotroph when As ( + 3 ) was used as the sole photosynthetic electron donor.
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""'Chlorobium chlorochromatii " "', originally known as " Chlorobium aggregatum ", is a symbiotic green sulfur bacteria that performs anoxygenic photosynthesis and functions as an obligate photoautotroph using reduced sulfur species as electron donors . " Chlorobium chlorochromatii " can be found in stratified freshwater lakes.