Soybeans normally nodulate with Rhizobium japonicum and fix nitrogen in symbiotic association. However, several interactions, under genetic control, have been reported which result in ineffective nodulation or failure of the fixation process despite substantial nodule development. The recessive gene, rj1 , (Williams and Lynch, 1954) in homozygous mode, results in the exclusion from nodulation of a broad spectrum of Rhizobium jabonicum strains in soil culture.
Devine, T. E.
"Research notes: Significance of incompatibility reactions of Rhizobium
japonicum strains with soybean host genotypes,"
Soybean Genetics Newsletter: Vol. 6
, Article 12.
Available at: http://lib.dr.iastate.edu/soybeangenetics/vol6/iss1/12