Replication/partition gene distributions in the tested Rlt nodule isolates. Southern hybridization assays were carried out with repA and repC markers of defined RtTA1 plasmids as molecular probes. The position of given markers in RtTA1 genome was shown in the left column. Positive hybridization was colored regarding its location in one of the following genome compartments: chromosome (red), plasmids (blue) and pSym (green); (-) indicates that given marker was not detected within a genome under applied Southern hybridization conditions. The letters a-f below the strains name indicate respective plasmids, ch-chromosome.