Green Phototrophic Bacteria

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The green phototrophic Bacteria include three phylogenetic groups: the Green sulfur Bacteria (Chlorobi), the green non-sulfur Bacteria (Chloroflexi), and the cyanobacteria (blue-green algae). They contain bacteriochlorophyl c, d, or e, or chloroohyl a (sometimes with chlorophyl b as well). These give many of these organisms a green color, but overall color is not a consistent trait among these organisms; this color is often masked by the abundant accessory pigments. These organisms also usually contain their antenna complex in discrete membranous organelles, the chlorosomes (green sulfur or non-sulfur Bacteria) or thylakoids (cyanobacteria). Purple phototrophic Bacteria use bacteriochlorophyls a and b, and house their antenna complexes in invaginations of the cytoplasmic membrane.

These three phylogenetic groups are also predominately phototrophic (at least among the familiar species), whereas the purple phototrophic Bacteria and heliobacteria are members of phylogenetic groups (the Proteobacteria and Firmicutes, respectively) that are predominantly non-phototrophic.