International Journal of Systematic and Evolutionary Microbiology, Vol 52, 1687-1693, Copyright © 2002 by Society for General Microbiology

Sinorhizobium morelense sp. nov., a Leucaena leucocephala-associated bacterium that is highly resistant to multiple antibiotics

E. T. Wang, Z. Y. Tan, A. Y. Willems, M. Fernandez-Lopez, B. Reinhold-Hurek and E. Martinez-Romero
Laboratorio de Microbiologia Agricola, Escuela Nacional de Ciencias Biologicas, IPN, Prol. de Carpio y Plan de Ayala, 11340 Mexico DF, Mexico

Sinorhizobium morelense sp. nov. is described to designate a group of bacteria isolated from root nodules of Leucaena leucocephala. S. morelense shows 98% 16S rRNA gene sequence similarity to some Sinorhizobium species and to Ensifer adhaerens. This novel species is distinguished from other Sinorhizobium species and from E. adhaerens by DNA--DNA hybridization, 16S rRNA gene restriction fragments and sequence and some distinctive phenotypic features. Strains of this species are highly resistant to some antibiotics, such as carbenicillin (1 mg ml(-1)), kanamycin (500 microg ml(-1)) and erythromycin (300 microg ml(-1)). They do not form nodules, but a nodulating strain, Lc57, is closely related to the novel species. Strain Lc04(T) (=LMG 21331(T)=CFN E1007(T)) is designated as the type strain of this novel species.

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