<![CDATA[Nucleotide sequence of gyrA and gyrB genes encoding subunit A and B of gyrase enzyme from genus of Rhizobium, Ensifer and Mesorhizobium were analyzed to determine evolutionary relationship among them. Maximum Likelihood and Kimura 2 parameter methods were used to construct phylogenetic tree and measure genetic distance. Phylogenetic tree based on nucleotide sequence of gyrA gene was compared to phylogenetic tree based on nucleotide sequence of gyrB gene. Comparison of identity percentage among nucleotide sequence of gyrA gene from genus Rhizobium, Ensifer and Mesorhizobium show similarity, where each of them have narrow range of identity percentage, however nucleotide sequence of gyrB gene from genus Rhizobium and Ensifer show wider identity percentage range than genus Mesorhizobium. Several member of genus Rhizobium and Ensifer have double copy of gyrB gene with identity percentage less than 50 percent between them. Topology of phylogenetic tree based on nucleotide sequence of gyrA gene have similar topology to topology of phylogenetic tree based on nucleotide sequence of gyrB gene, except for additional branch formed by one of additional copy of gyrB sequences. .]]>
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