Photosynthetic bacteria

Autotrophic prokaryotes derive all their carbon from inorganic sources, and photoautotrophs utilize light energy (anaerobic Chromatium movie and aerobic Cyanobacteria). Some prokaryotes are heterotrophic, utilizing organic substances (environmental nutrients or via infection) as a source of carbon.

The purple and green photosynthetic bacteria obtain energy from light (Rhodospirillum rubrum movie).

Photosynthetic prokaryotes include: Green: Cyanobacteria, green filamentous, green sulfur, prochlorophytes. Purple : purple sulfur, and purple nonsulfur bacteria.

Oxygenic photosynthesis, utilizing H2O as electron donor : Cyanobacteria, prochlorophytes
Nonoxygenic photosynthesis utilizing S– or So or H2 as electron donor:
green filamentous, green sulfur, purple sulfur, and purple nonsulfur

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