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Silva, C. et al.

Claudia Silva, Feng Ling Kan, Esperanza Martínez-Romero,

Population genetic structure of Sinorhizobium meliloti and S. medicae isolated from nodules of Medicago spp. in Mexico.

We studied the genetic structure of 176 bacterial isolates from nodules of Medicago sativa, M. lupulina and M. polymorpha in fifteen sites distributed in three localities in Mexico. The strains were characterized by multilocus enzyme electrophoresis, plasmid profiles, PCR restriction fragment length polymorphism of 16S rRNA genes and of the intergenic spacer between 16S and 23S rRNA genes, and partial sequences of glnII, recA and nodB. Most of the strains were classified as Sinorhizobium meliloti, and a high genetic diversity was recorded. Six strains were classified as Sinorhizobium medicae, with no genetic variation. Phylogenetic and population genetic analyses revealed evidence of frequent recombination and migration within species.[1]

References

Population genetic structure of Sinorhizobium meliloti and S. medicae isolated from nodules of Medicago spp. in Mexico. Silva, C., Kan, F.L., Martínez-Romero, E. FEMS Microbiol. Ecol. (2007) [Pubmed]

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