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Unformatted text preview: Crenarch1 The Archaea: Crenarchaeota Archaea
17.9: Habitats and Energy Metabolism of Crenarchaeota Crenarchaeota 17.10: Hyperthermophiles From Terrestrial 17.10: Volcanic Habitats Volcanic 17.11: Hyperthermophiles From Submarine 17.11: Volcanic Habitats Volcanic 17.12: Nonthermophilic Crenarchaeota 17.12: phylogenetic tree of the Archaea Archaea Euryarch2 (Fig 17.1, 12th ed) Crenarch2 The Crenarchaeota: The
• much of the current information about this group is derived from genomic analysis only • most metabolize sulfur in some way • most cultured representatives are hyperthermophiles • obligate anaerobes • chemoorganotrophs or chemolithotrophs • DNA of marine crenarchaeotes has been found worldwide, including polar waters Crenarch3 percentage of total prokaryotes that are archaeal, bacterial in North Pacific ocean water: in (Fig 23.19, 12th ed) Crenarch4 The Crenarchaeota: The a solfatara in Yellowstone National Park: solfatara Crenarch5 (Fig 17.16, 12th ed) sulfur-rich hot spring: sulfur-rich Crenarch5a (Fig 17.16, 12th ed) Crenarch6 Sulfolobus: Sulfolobus
• thermoacidophile: temperature optimum 70-80°C • aerobic • fixes CO2 autotroph • pH optimum 2-3 • often grow on sulfur crystals • oxidizes sulfur (S0), H2S to sulfuric acid (H2SO4) → lowers pH of environment • will also oxidize Fe2+ → Fe3+ chemolithotroph Sulfolobus acidocaldarius (Fig 17.17, 12th ed) ...and can grow as a chemoorganotroph too acidic, iron-rich geothermal spring: acidic, Crenarch6a (Fig 17.16, 12th ed) Imperial Geyser (neutral pH boiling spring): Imperial Crenarch6b (Fig 17.16, 12th ed) Crenarch7 Crenarch8 cold-dwelling cold-dwelling Crenarchaeota: Crenarch9 Antarctica DAPI-stained cells DAPI-stained Crenarchaeota under-ice seawater • stained with DAPI (DNA stain) • stained with fluorescent probe for crenarchaeotal 16S rRNA (Fig 17.22, 12th ed) ...
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- Spring '11