Abstract
Green and purple non-sulphur bacteria (Chloroflexaceae and Rhodospirillaceae, respectively) are facultative anaerobes which utilize distinct membrane morphologies to accomodate the pigments and the redox components necessary for both respiration and anoxygenic photosynthesis 1. When these phototrophs are grown aerobically in the light or the dark, the cells develop both respiratory and photosynthetic transport chains operating on the same continuous cytoplasmic membrane (CM). However, in all the purple non-sulphur bacteria the respiratory components are located mainly on the CM-peripheral part and the synthesis of the photosynthetic apparatus is associated with the elaboration of a complex intracytoplasmic membrane array (ICM) (chromatophores) 2, which is regulated by external factors such as oxygen tension and light-energy flux. Conversely, the situation in green bacteria is quite different: the photosynthetic apparatus is composed of the chlorosomes (antenna structures similar to the phycobi1isomes of red algae and cyanobacteria) plus the cytoplasmic membrane immediately adyacent to each chlorosome. The reaction centers as well as the other components forming the respiratory and the photosynthetic apparatuses are contained entirely within the CM 3.
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