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Microbacterium ulmi sp. nov., a xylanolytic, phosphate-solubilizing bacterium isolated from sawdust of Ulmus nigra

Departamento de Microbiología y Genética, Edificio Departamental, Campus Miguel de Unamuno, Universidad de Salamanca, 37007 Salamanca, Spain

Correspondence
Martha E. Trujillo
mett{at}usal.es

A xylanolytic and phosphate-solubilizing bacterium isolated from sawdust of Ulmus nigra in Salamanca was characterized by a polyphasic approach. The novel strain, designated XIL02^T, was Gram-positive, aerobic, catalase- and oxidase-negative, rod-shaped and non-motile. Phylogenetically and chemotaxonomically, it was related to members of the genus Microbacterium. According to 16S rRNA gene sequence analysis, it is closely related to Microbacterium arborescens and Microbacterium imperiale; however, DNA–DNA hybridization showed reassociation values less than 70 % with the type strains of these species. In chemotaxonomic analyses, the major menaquinones detected were MK-12, MK-13 and MK-11 and the major fatty acids were anteiso-C_{15 : 0}, anteiso-C_{17 : 0} and iso-C_{16 : 0}; the peptidoglycan was of the type B2. The G+C content determined was 69 mol%. Based on the present data, it is proposed that strain XIL02^T (=LMG 20991^T=CECT 5976^T) be classified as the type strain of a novel Microbacterium species, for which the name Microbacterium ulmi sp. nov. is proposed.

The GenBank/EMBL/DDBJ accession number for the 16S rDNA sequence of isolate XIL02^T is AY062021.

A 16S rDNA-based neighbour-joining tree including all species of Microbacterium is available as supplementary material in IJSEM Online.

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