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Symbioses between uptake hydrogenase host-regulated (Hup-hr) phenotypes ofBradyrhizobium japonicum and exotic, agronomically unadapted soybean germ plasm were examined for expression of uptake hydrogenase activity. Determinations for hydrogen evolution and uptake hydrogenase activity identified five plant introduction (PI) lines which formed hydrogen-oxidizing symbioses with strains USDA 61 and PA3 6c. Hup-hr strains belonging to serogroup 94 expressed uptake hydrogenase activity in symbioses with PI 181696 and PI 219655 at rates sufficient to prevent hydrogen from escaping the nodules. The identification of soybean germ plasm forming hydrogen-oxidizing symbioses with Hup-hr bradyrhizobia potentially has implications for enhancing nitrogen fixation efficiency in soybean production.

Hydrogen Oxidation by the Host-Controlled Uptake Hydrogenase Phenotype of Bradyrhizobium japonicum in Symbiosis with Soybean Host Plants