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Appl Environ Microbiol. 1991 June; 57(6): 1863-1865
Copyright © 1991, American Society for Microbiology. All Rights Reserved.

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

Soybean and Alfalfa Research Laboratory, Agricultural Research Service, U.S. Department of Agriculture, HH-19, Building 011, BARC-West, Beltsville, Maryland 20705

ABSTRACT

Symbioses between uptake hydrogenase host-regulated (Hup-hr) phenotypes of Bradyrhizobium 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.

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