Thodospirillaceae
Athiorhodaccae
Purple
Non
S
Bacteria -l. Only one photosystem, PS 2. Photosynthetic pigments are BChl a or b Carotenoids of groups I, 2 and 4 are present.3. Electron sources are mainly organic compounds and H2
In some cases also H2S, but not S.
4. Respiration is aerobic (oxygen respiration)5.Genera:Rhodospirillum,Rhodopseudomonas,Rhodomicrobium.





