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A broad-host-range plasmid, pEA2-21, containing aBradyrhizobium japonicum nodABC'-'lacZ translational fusion was used to identify strain-specific inhibitors of the genes required for soybean nodulation, the commonnod genes. The responses of type strains ofB. japonicum serogroups USDA 110, USDA 123, USDA 127, USDA 129, USDA 122, and USDA 138 tonod gene inhibitors were compared. Few compounds inhibitednod gene expression inB. japonicum USDA 110. In contrast,nod gene expression in strains belonging to several other serogroups was inhibited by most of the flavonoids tested. However, the application of two of these strain-specific compounds, chrysin and naringenin, had little effect on the pattern of competition between indigenous and inoculum strains ofB. japonicum in greenhouse and field trials. Preliminary studies with radiolabeled chrysin and naringenin suggest that the different responses tonod gene inhibitors may be partly due to the degree to which plant flavonoids can be metabolized by each strain.

Strain-Specific Inhibition of nod Gene Induction in Bradyrhizobium japonicum by Flavonoid Compounds