Cross Index Chromatium
SuperSet Prokaryote, Eubacteria, Anoxygenic Phototrophic Bacteria
Compare Purple Bacteria

Green Bacteria

Anaerobic chemotropic Erythrobacter longus,
Contrast Oxygenic Phototrophic Bacteria Archaea
Subset  

 

Morphology Chromatium
CELLULAR  
Staining Gram-negative.
Morphology Cells straight to slightly curved rod-shaped or ovoid, with rounded ends. Cells occur singly or in pairs or may stick together and form clumps
Motility motile by monotrichous or multitrichous polar flagella
Specialized structures ,.. Contain internal photosynthetic membrane systems of vesicular type in which the photosynthetic pigments bacteriochlorophyll a and carotenoids of groups 1-4 are located. Do not contain gas vacuoles

elemental sulfur is formed as an intermediate oxidation product and stored in the form of highly refractile globules inside the cells

Storage materials: polysaccharides, poly-B-hydroxybutyrate, polyphosphates.

 

Division  
COLONIAL  
Solid surface  
Liquid  

 

Growth Parameters Chromatium
PHYSIOLOGICAL  
Tropism Under anaerobic conditions, all species are capable of photolithoautotrophic growth with sulfide or elemental sulfur as electron donor All species are potentially mixotrophic and able to photoassimilate a number of simple organic compounds; acetate or pyruvate are most widely used
Oxygen Molecular hydrogen may be used as electron donor..
pH  
Temperature Chromatium species are mesophilic with optimal growth temperatures between 20 and 40`C.
Requirements  
Products Sulfate is the ultimate oxidation product
Enzymes  
Unique features  
ENVIRONMENTAL  
Habitat  
Lifestyle  
Pathogenicity  
Distribution  

 

Genome Chromatium
G+C Mol %  
   

 

Reference Chromatium
First citation Perty,M., 1852. Zur Kenntnis kleinster Lebensformen. Jent and Reinert, Bern I-VIII, pp 1-228
The Prokaryotes  
Bergey's Systematatic p 1637 Norbert Pfennig
Bergey's Determinative p 354
References