Fig. 1.

Percent identity plot of linear pairwise comparison of the symbiosis island sequences of three M. loti strains: R7A, NZP2037, and MAFF303099. The three M. loti strains were compared by GenomeMatcher programs (20). The colored horizontal bars represent the symbiosis island sequences of R7A, NZP2037 and MAFF303099. Colors indicate the percent nucleotide identity in the alignment output by BLASTN. Roman numbers on the NZP2037 bar indicate the positions of the major operons conserved in the three strains. The corresponding operons are as follows: (I): thiamine biosynthesis-related operon, (II): nodulation genes (noeK-noeJ), (III): biotin biosynthesis-related operon, (IV): nicotinate biosynthesis-related operon, (V): nodulation genes (nodZ-noeL-nolK), (VI): nitrogen fixation-related operon, (VII): nitrogen fixation-related operon, (VIII): nodulation genes (nodS-nodA-nodC-nodI-nodJ-nolO), (IX): nodulation genes (nodB, nodD-nolL-nodD), (X): Type IV secretion system-related operon, (XI): island transfer-related operon, (XII): nitrogen fixation-related operon