A bacterial strain, designated GEM5T, was isolated from sand soil samples from the Qinghai-Tibet Plateau. The polyphasic study confirmed the affiliation of the isolate with the genus Massilia. GEM5T had Gram-stain-negative, non-spore-forming and rod-shaped cells and grew at 4-30 °C, pH 6-8 and with 0-2 % (w/v) NaCl. Its cell wall contained ribose. Q8 was the predominant respiratory quinone, and summed feature 3 (C16 : 1ω6c/ω7c) and C16 : 0 were the major components of the fatty acids. The polar lipids were diphosphatidylglycerol, phosphatidylethanolamine, phosphatidylglycerol, an unidentified phospholipid, an unidentified aminolipid and four unidentified lipids. The DNA G+C content was 65.1 mol%. The phylogenetic analysis based on the 16S rRNA gene showed a stable clade being formed by GEM5T, Massilia timonae CCUG 45783T (97.94 %) and Massilia oculi CCUG 43427AT (97.58 %). The average nucleotide identity (ANIb) values between GEM5T and M. timonae CCUG 45783T, M.oculi CCUG 43427AT were 91.3 and 91.7 %, respectively. On the basis of the morphological, physiological and chemotaxonomic pattern, it was proposed that strain GEM5T (=JCM 32744T=CICC 24458T) should be classified as representing a member of the genus Massilia with the name Massilia arenae sp. nov.
Keywords: Massilia arenae; Mycobacterium virulence operon; Qinghai-Tibetan Plateau; sand soil.