theme 7(3)other phototrophs

• Genera: Heliobacterium, Heliorestis (ppp)

  • Heliobacteria are phototrophic gram(+) bacteria in phylum Firmicutes
  • anoxygenic phototrophs with FeS-type photosystem
  • produce unique pigment bacteriochlorophyll g
  • grow photoheterotrophically using pyruvate, lactate, acetate, butyrate
  • five genera: Heliobacterium, Heliophilum, Heliorestis, Heliomonas, Heliobacillus.
  • all rod-shaped or filamentous cell
• ppp con

  • Heliophilum forms bundles of cells that move as a unit
  • strict anaerobes that can ferment pyruvate
  • produce endospores
  • reside in soils or in highly alkaline environments (e.g., soda lakes)
• Phototrophic Acidobacteria

  Genus: Chloracidobacterium

  • In thermal spring photosynthetic microbial mats of Yellowstone National Park (USA).
• Chloracidobacterium thermophilum.

  • thermophilic oxygen-tolerant anoxygenic phototroph
  • like green sulfur bacteria, producing chlorosomes, bacteriochlorophyll, and using FeS-type photosystem
  • can grow aerobically - photoheterotroph that uses short-chain fatty acids as carbon sources - not autotrophic