Hydrogenase Activity of Soybean Nodules Doubly Infected withBradyrhizobium japonicumandB. elkanii

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Abstract
Rhizobitoxine (2-amino-4-(2-amino-3-hydropropoxy)-trans-but-3-erioic acid) is a phytotoxin produced by some strains of Bradyrhizobium species. Rhizobitoxine-producing strains often induce chlorosis in new leaves of soybean as a result of the synthesis of the toxin in nodules (Owens and Wright 1964; Owens et al. 1972). Some of the B. japonicum bacteroids possessing the hydrogen uptake (Hup) system are capable of ATP production by recycling H2 evolved from nitrogenase (Evans et al. 1987). Adequate uptake hydrogenase activity in soybean bacteroids often enhances plant growth, as well as the efficiency of energy utilization during nitrogen fixation (Evans et al. 1987).