Abstract
Regulation of photosynthesis gene expression has been a long studied area of research with anoxygenic phototrophic bacteria. This area of study predates the classical analysis by Cohen-Bazire et al., (1957) who performed a detailed measurement of the repressing effects of light and oxygen on synthesis of the purple bacterial photosystem. In their study they demonstrated that shifting photosynthetically growing cells from anaerobic to aerobic conditions resulted in the immediate cessation of photopigment biosynthesis. A similar effect was also observed when photosynthetically grown cells are shifted from low to high light intensity. We now know that the repressing effects of these environmental factors is a result, in part, to the regulation of photosynthesis gene expression. It is this topic, the repressing effects of light and oxygen on photosynthesis gene expression, that this review will be centered. This chapter covers our current understanding of cis- and trans-acting factors that controls transcription of the light harvesting and reaction center structural genes as well as genes involved in photopigment biosynthesis.
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