SUMMARY: Bacteroids isolated from nodules produced by one strain of (CC705) had strong nitrate-reducing activity and reduced CH to CH and N to NH anaerobically with nitrate. Bacteroids of another strain (CB1809) were much less active nitrate reducers and reduced little CH anaerobically. Nitrite, which accumulated in the medium in anaerobic assays, was an inhibitor of CH reduction in both aerobic and anaerobic conditions. Succinate, at about 25 mM, stimulated both nitrate reduction and CH reduction under aerobic conditions. Glucose stimulated CH reduction up to 120 mM but nitrate reduction was inhibited in the presence of glucose. In terms of electrons transferred, the aerobic pathway appeared to be about 2.5 times more efficient than the anaerobic pathway in supporting nitrogenase activity of CC705 bacteroids.


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