TABLE 1.

S. meliloti strains used in this study

StrainRelevant characteristic(s)Source or reference
Rm1021Wild type17
Rm7210exoY210::Tn517
Rm7095exoR95::Tn512
Rm7096exoS96::Tn512
Rm8395exoR395::Tn5-233G. C. Walker
Rm8396exoS396::Tn5-233G. C. Walker
RmHC1exoY210::Tn5 exoR395::Tn5-233This work
RmHC2exoY210::Tn5 exoR395::Tn5-233This work