Details for Chromatiales

Participants Studying this Organism
Thermal Features for this Organism


NCBI Taxonomy ID: 135613
NCBI Taxonomy Rank: Order
The purple phototrophic bacteria carry out anoxygenic photosynthesis; unlike the cyanobacteria no O2 is evolved. Purple bacteria contain chlorophyll pigments called bacteriochlorophylls and additionally contain any of a variety of carotenoid pigments. Together, these pigments give purple bacteria their spectacular colors, usually purple, red, or brown. The purple bacteria are a morphologically diverse group, and the taxonomy of these organisms has been established along phylogenetic, morphological, and physiological lines.

Purple bacteria synthesize intracytoplasmic photosynthetic membrane systems into which their pigments are inserted. These membranes can be of various morphologies but in all cases originate from invaginations of the cytoplasmic membrane. These internal membranes allow purple bacteria to increase their specific pigment content and to thus better utilize the available light; when cells are grown at high light intensities, internal membranes are few and pigment contents low, while at low light intensities, the cells are packed with membranes and photopigments.
Taken from the text Brock Biology of Microorganisms (10th ed.). Madigan, M.T., Martinko, J.M., and Parker, J. 2003. Prentice Hall. 354-355p.