Strain GIMN 1.002T, a UV radiation-tolerant bacterium, was isolated from the upper sand layers of the Gobi desert, Xinjiang, China and characterized in order to determine its taxonomic position. Cells were Gram-reaction-positive, heterotrophic, strictly aerobic, short rods. 16S rRNA gene sequence analysis revealed that strain GIMN 1.002T belonged to the genus Microbacterium and was closely related to Microbacterium arborescens DSM 20754T (98.8 % 16S rRNA gene sequence similarity) and Microbacterium imperiale DSM 20530T (98.7 %). However, strain GIMN 1.002T had low DNA–DNA relatedness with M. arborescens DSM 20754T (17.1 %) and M. imperiale DSM 20530T (12.89 %). Strain GIMN 1.002T possessed chemotaxonomic markers that were consistent with its classification in the genus Microbacterium, i.e. MK-11, MK-12 and MK-10 as major menaquinones and anteiso-C15 : 0 (38.67 %), iso-C16 : 0 (18.16 %) and iso-C15 : 0 (17.46 %) as predominant cellular fatty acids. The DNA G+C content was 67.74 mol%. The cell-wall sugar was rhamnose. On the basis of the data from this study, strain GIMN 1.002T represents a novel species of the genus Microbacterium, for which the name Microbacterium radiodurans sp. nov. is proposed. The type strain is GIMN 1.002T (=CCTCC M208212T =NRRL B-24799T).
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