Thodospirillaceae Athiorhodaccae Purple Non S Bacteria

Thodospirillaceae Athiorhodaccae Purple Non S Bacteria

	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.
6.The Rhodospirillaceae are facultative heterotrophs and can grow both photoautotrophically and photoheterotrophically. They can also grow in the dark, both aerobically and anaerobically, as chemoheterotrophs. Photosynthesis is strictly anaerobic. All can fix Ng photosynthetically .