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Purple Non-Sulfur Bacteria

Purple Non-Sulfur Bacteria. Christina Machak HMC 2012. Where are PNS found?. Originally named “non-sulfur” because it was thought that they could not use sulfide as electron donor

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Purple Non-Sulfur Bacteria

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  1. Purple Non-Sulfur Bacteria Christina Machak HMC 2012

  2. Where are PNS found? • Originally named “non-sulfur” because it was thought that they could not use sulfide as electron donor • Can tolerate small concentrations of sulfur, but much lower than green and purple sulfur bacteria. High Concentrations of H2S are toxic • Primarily anaerobes, but can carry out respiration in low O2 concentrations Therefore they occupy a specific niche….

  3. Purple non-sulfur bacteria grow in where they have access to sunlight and are not in contact with oxygen

  4. Variety in metabolism… Most PNS can use fermentation or respiration to grow in the dark. Photo-auto-trophic growth Photo-hetero-trophic growth CO2+H2 CO2+H2S Sugars Amino Acids Fatty Acids

  5. Day 1: Samples from the mats were filtered and the filters were placed on enrichment plates. NH4+ Day 7: re-streak colonies ADD NITROGEN SOURCE!

  6. Day 14: Results

  7. Carotenoid pigments and bacteriochlorophylls give phototrophic purple bacteria their color.

  8. From: Stomp et al., 2007

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