Advances in Photosynthesis and Respiration - …
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21/12/2017 · Advances in Photosyn ..
Aerobic anoxygenic photosynthetic bacteria are thought of as atypical photosynthetic microorganisms in contrast to purple sulfur or nonsulfur bacteria, which can utilize light as the sole source of energy for anaerobic growth. Nevertheless, photosynthetic activity in these bacteria was shown by (i) the reversible photooxidation of cytochromes and the reversible photobleaching of Bchl in the RC; (ii) photoinhibition of respiration; and (iii) a light-stimulated increase in ATP pools and an increase in growth rate and biomass production (, , , ). The contribution of light to energy metabolism in aerobic photosynthetic bacteria seems to be small and was best evinced during an alternating light-and-dark regimen of cultivation, and so light seems to be used as a supplementary source of energy during intermittent illumination of these bacteria ().
Our discovery of aerobic anoxygenic photosynthetic bacteria in a deep-ocean hydrothermal vent environment raises broad possibilities for future investigations. Although we cannot say whether JF-1 evolved in proximity to a hydrothermal vent or came to colonize this environment later, the abundance (approaching 10% of all cells cultivated on the media used; see Table ) of this bacterium in plume samples indicates that the ability to produce Bchl may be of selective advantage. It will be interesting to see if it is possible to differentiate between the evolution of photosynthesis at deep hydrothermal vents and that in sun-irradiated environments. Perhaps, isolate JF-1 exhibits some photosynthetic properties of evolutionarily early photosynthetic bacteria and the respiratory dependence of this species developed during subsequent evolution.
Advances in Photosynthesis and Respiration
Bryant DA, Liu Z, Li T et al. (2012) Comparative and functional genomics of anoxygenic green bacteria from the taxa Chlorobi, Chloroflexi, and Acidobacteria. In: Burnap RL and Vermaas WFJ (eds) Functional Genomics and Evolution of Photosynthetitic Systems, Advances in Photosynthesis and Respiration vol. 33, pp. 47–102. New York: Springer.
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