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An ionizing- and UV-radiation-resistant bacterial strain, designated ZLM-202(T), was isolated from an arid soil sample collected from Xinjiang Province, north-west China. The soil sample was irradiated before serial dilution plating was performed using twofold-diluted marine agar. Phylogenetic analysis based on 16S rRNA gene sequences indicated that strain ZLM-202(T) was a member of the genus Deinococcus, exhibiting sequence similarities of 86.3-92.2% to the type strains of recognized Deinococcus species. Strain-ZLM-202(T) was strictly aerobic and showed optimum growth at 30-37 degrees C and pH 7.0. The major respiratory menaquinone was MK-8. The major fatty acids were 16:1 omega 7c, 16 : 0, 15 : 1 omega 6c, 15 : 0 iso and 16 : 1 omega 5c. L-ornithine was detected in its peptidoglycan. The polar lipid profile consisted mainly of various unknown phosphoglycolipids, aminophospholipids, glycolipids and phospholipids. The DNA G + C content was 65.5 mol. %. The strain was shown to be extremely resistant to gamma radiation (>10 kGy) and UV light (> 600 J m(-2)). On the basis of the phylogenetic, chemotaxonomic and phenotypic data, strain ZLM-202(T) represents a novel species of the genus Deinococcus, for which the name Deinococcus soli sp. nov. is proposed. The type strain is ZLM-202(T) (=CCTCC AB 208223(T)= KCTC 13419(T)).