SUMMARYCarbon metabolism in Bradyrhizobium japonicum bacteroids is reviewed. Additionally, the bacteroid tricarboxylic acid (TCA) cycle and its regulation under oxygen-limited conditions is considered, with emphasis on possible sites of TCA cycle rate-limiting reactions. Furthermore, kve consider other adaptive pathways that may be employed by these organisms while in symbiosis. These pathways include: (1) a poly-fl-hydroxybutyrate shunt, (2) a malate-aspartate shuttle, (3) an a-ketoglutarate-glutamate shunt, (4) a modified dicarboxylic acid cycle, and (5) fermentation pathways leading to lactate, acetaldehyde and ethanol. The effects of oxygen limitation on host carbon metabolism are also considered briefly.
INTRODUCTIONLegume root nodules represent a unique ecological niche for Bradyrhizobium and Rhizobium.
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