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1 Departamento de Microbiología y Genética, Universidad de Salamanca, Salamanca, Spain
2 Laboratorium voor Microbiologie, Vakgroep Biochemie, Fysiologie en Microbiologie, Universiteit Gent, K. L. Ledeganckstraat 35, B-9000 Gent, Belgium
3 Centro Regional de Diagnóstico de la Junta de Castilla y León, Salamanca, Spain
Correspondence
Encarna Velázquez
evp{at}gugu.usal.es
Some varieties of sugar beet, Beta vulgaris, cultivated in northern Spain have large deformations that resemble the tumours produced by Agrobacterium species. In an attempt to isolate the agent responsible for these deformations, several endophytic slow-growing bacterial strains were isolated, the macroscopic morphology of which resembled that of Bradyrhizobium species. These strains were not able to produce tumours in Nicotiana tabacum plants and, based on phylogenetic analysis of their 16S rRNA, they are closely related to the genus Bradyrhizobium. Phenotypic and molecular characteristics of these strains revealed that they represent a species different from all Bradyrhizobium species previously described. Sequence analysis of the 16S–23S rDNA intergenic spacer region indicated that these novel strains form a homogeneous group, related to Bradyrhizobium japonicum, Bradyrhizobium liaoningense and Bradyrhizobium yuanmingense. DNA–DNA hybridization confirmed that these strains represent a novel species of the genus Bradyrhizobium, for which the name Bradyrhizobium betae sp. nov. is proposed. The type strain is PL7HG1T (=LMG 21987T=CECT 5829T).
Published online ahead of print on 9 February 2004 as DOI 10.1099/ijs.0.02971-0.
The GenBank accession number for the 16S rRNA gene sequence of Bradyrhizobium betae PL7HG1T is AY372184.
Photographs of the tumour-like deformations described here are available as supplementary material in IJSEM Online.
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