Purple bacteria
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Purple bacteria are proteobacteria that are phototrophic, i.e. capable of producing energy through photosynthesis. They are pigmented with bacteriochlorophyll a or b, together with various carotenoids. These give them colours ranging between purple, red, brown, and orange. Photosynthesis takes place at reaction centers on the cell membrane, which is folded into the cell to form sacs, tubes, or sheets, increasing the available surface area.
Like most other photosynthetic bacteria, purple bacteria do not produce oxygen, because the reducing agent involved in photosynthesis is not water. In some, called purple sulfur bacteria, it is either sulfide or elemental sulfur. The others, called purple non-sulfur bacteria, typically use hydrogen although some may use other compounds in small amounts. At one point these were considered families, but RNA trees show the purple bacteria make up a variety of separate groups, each closer relatives of non-photosynthetic proteobacteria than one another.
Purple non-sulfur bacteria are found among the alpha and beta subgroups, including:
| Rhodospirillales | |
| Rhodospirillaceae | e.g. Rhodospirillum |
| Acetobacteraceae | e.g. Rhodopila |
| Rhizobiales | |
| Bradyrhizobiaceae | e.g. Rhodopseudomonas |
| Hyphomicrobiaceae | e.g. Rhodomicrobium |
| Rhodobiaceae | Rhodobium |
| Other families | |
| Rhodobacteraceae | e.g. Rhodobacter |
| Rhodocyclaceae | e.g. Rhodocyclus |
| Comamonadaceae | e.g. Rhodoferax |
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