Appelbaum E R, McLoughlin T J, O'Connell M, Chartrain N
J Bacteriol. 1985 Jul;163(1):385-8. doi: 10.1128/jb.163.1.385-388.1985.
A 200-megadalton plasmid was mobilized from Rhizobium japonicum USDA 191 to other Rhizobium strains either that cannot nodulate soybeans or that form Fix- nodules on certain cultivars. The symbiotic properties of the transconjugants indicate that both soybean specificity for nodulation and cultivar specificity for nitrogen fixation are plasmid encoded.