Abstract
There are two essential processes in endosymbiotic bacteroids for which the ambient oxygen concentration is critical: respiration and N2 fixation. The apparently paradoxical requirements of respiration for oxygen supply and of nitrogenase for oxygen exclusion are met (i) by the induction of a respiratory chain with a high-affinity terminal oxidase that functions at nanomolar free oxygen, and (ii) by a sophisticated redox control system that allows nitrogenase gene expression only at these low O2 tensions. Our laboratory is engaged in studies aimed at elucidating the molecular genetic basis of both processes (i) and (ii) in the soybean root nodule symbiont, Bradyrhizobium japonicwn. This article summarizes the progress made recently.
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Hennecke, H. et al. (1990). A genetic approach to analyze the critical role of oxygen in bacteroid metabolism. In: Gresshoff, P.M., Roth, L.E., Stacey, G., Newton, W.E. (eds) Nitrogen Fixation. Springer, Boston, MA. https://doi.org/10.1007/978-1-4684-6432-0_30
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DOI: https://doi.org/10.1007/978-1-4684-6432-0_30
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