title: The Soybean Rj4 Allele Restricts Nodulation by Bradyrhizobium japonicum Serogroup 123 Strains.
abstract: Of nine Bradyrhizobium japonicum serogroup 123 strains examined, 44% were found to be restricted for nodulation by cultivar Hill. Nodulation studies with soybean isoline BARC-2 confirmed that the soybean Rj4 allele restricts nodulation by the same serogroup 123 isolates. Immunological analyses indicated that B. japonicum strains in serogroups 123 and 31 share at least one surface somatic antigen.
authors.affiliation: Department of Soil Science and Department of Microbiology, University of Minnesota, St. Paul, Minnesota 55108, and Soybean and Alfalfa Research Laboratory, Agricultural Research Service, U.S. Department of Agriculture, Beltsville, Maryland 20705.
authors.forename: M J
authors.initials: MJ
authors.lastname: Sadowsky
authors.forename: P B
authors.initials: PB
authors.lastname: Cregan