Chromatiaceae - Thiohodaceae Purple S Bacteria

Chromatiaceae - Thiohodaceae Purple S Bacteria

	Chromatiaceae - Thiohodaceae Purple S Bacteria - 1. Only one photosystem, PS I . 2. Photosynthetic pigm ents arc BChl a or b. Carotenoids of groups J, 3 and 4 are present. 3. Electron sources are H2S, S, thiosulphate or molecular hydrogen. In some cases also organic molecules.
4. Respiration is anaerobic. 5. Genera: Chromalium. Thiocystis, Thiospirillum. Thiocapsa, Lamprocystis, Thiodictyon, Thiopedia. 6. Some species can grow heterotrophically, e.g. on pyruvate, in the dark. All can fix N2 photosynthetically.