title: Phenotypic Diversity among Strains of Bradyrhizobium japonicum Belonging to Serogroup 110.
abstract: Thirty-four strains of Bradyrhizobium japonicum within serogroup 110 were examined for phenotypic diversity. The strains differed in their abilities to nodulate and fix dinitrogen with Glycine max (L.) Merr. cv. Williams. Thirteen strains expressed uptake hydrogenase activity when induced as free-living cultures in the presence of 2% hydrogen and oxygen. Six bacteriophage susceptibility reactions were observed. Each of the strains produced either a large, mucoid or a small, dry colony morphology, but colony type was not related to effectiveness for nitrogen fixation.
authors.affiliation: Department of Botany, Zagazig University, Cairo, Egypt; Department of Agronomy, University of Maryland, College Park, Maryland 20742 ; and Soybean and Alfalfa Research Laboratory, Agricultural Research Service, U.S. Department of Agriculture, Beltsville, Maryland 20705.
authors.forename: H A
authors.initials: HA
authors.lastname: Basit
authors.forename: J S
authors.initials: JS
authors.lastname: Angle
authors.forename: S
authors.initials: S
authors.lastname: Salem
authors.forename: E M
authors.initials: EM
authors.lastname: Gewaily
authors.forename: S I
authors.initials: SI
authors.lastname: Kotob
authors.forename: P
authors.initials: P
authors.lastname: van Berkum