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A sensitive tritium exchange assay was applied to the Rhizobium system for measuring the expression of uptake hydrogenase in free-living cultures of Rhizobium japonicum. Hydrogenase was detected about 45 hours after inoculation of cultures maintained under microaerophilic conditions (about 0.1% O(2)). The tritium exchange assay was used to screen a variety of different strains of R. japonicum (including major production strains) with the findings that about 30% of the strains expressed hydrogenase activity with identical results being observed using an alternative assay based on uptake of H(2). The relative efficiency of intact soybean nodules inoculated with 10 different rhizobial strains gave results identical to those obtained using free-living cultures. The tritium exchange assay provides an easy, quick, and accurate assessment of H(2) uptake efficiency of intact nodules.

Determination of Hydrogenase in Free-living Cultures of Rhizobium japonicum and Energy Efficiency of Soybean Nodules