Colorless sulfur bacteria
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Colorless Sulfur Bacteria. Blanca Pérez Hopkins Microbiology Course 2010. Colorless Sulfur Bacteria. Comprises a very heterogeneous group of chemoautotrophic bacteria Use of reduced forms of S as e- source

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Colorless Sulfur Bacteria

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Colorless sulfur bacteria

Colorless Sulfur Bacteria

Blanca Pérez

Hopkins Microbiology Course 2010


Colorless sulfur bacteria1

Colorless Sulfur Bacteria

  • Comprises a very heterogeneous group of chemoautotrophic bacteria

  • Use of reduced forms of S as e- source

  • Most of them require O2 as e- acceptor, but a few are able to grow anaerobically using nitrogen oxides

Sulfur cycle,

Robertson and Keuenen (2006)


Colorless sulfur bacteria2

Thiobacillus

Thiomicrospira

Thiosphaera

Sulfolobus

Acidianus

Thermothrix

Thiovulum

Beggiatoa

Thiothrix

Thioploca

Thiodendron

Thiobacterium

Macromonas

Achromatium

Thiospira

Will

Colorless Sulfur Bacteria


Gradient tubes

Gradient tubes

O2

Interface between opposing oxygen and sulfide gradients

H2S

H2S + 2O2 SO42- + 2H+


Gradient tubes1

Gradient tubes

Kosh


Gradient tubes2

Gradient tubes

Spirocheta sp.

symbiotic relationships between Spirochaeta plicatilis with Beggiatoa

Hyansoo


Thiosulfate plates

Thiosulfate plates

  • Use of thiosulfate as e- donor (with O2 or NO3- as e- acceptor)

  • Production of sulfuric acid (bromothymol blue)

Anaerobic incubation (w NO3-)

Aerobic incubation (w/o NO3-)


Thiosulfate plates aerobic conditions

Thiosulfate plates: aerobic conditions

2 days

Sulfuric acid

Na2S2O3+ 2O2+ H2O  Na2SO4+ H2SO4


Thiosulfate plates anaerobic conditions

Thiosulfate plates: anaerobic conditions

~2 weeks

Sulfuric acid

Elemental sulfur

Aerobic

incubation


Thiosulfate plates1

Thiosulfate plates


Colorless sulfur bacteria3

Colorless Sulfur Bacteria

Blanca Pérez

Hopkins Microbiology Course 2010


Desulfovibrio sulfodismutans

Desulfovibrio sulfodismutans

  • can grow anaerobically by the disproportionation of thiosulfate to sulfate and sulfide

  • Sulfate Reducing Bacteria: disproportionation of thiosulfate


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