Starkeya koreensis sp. nov., isolated from rice straw

A facultatively chemolithoautotrophic, Gram-negative, aerobic, highly curved rod-shaped, non-motile, non-spore-forming bacterium, strain Jip08(T), was isolated from rice straw in Daejeon, South Korea. Strain Jip08(T) produced colourless colonies (1.0-1.5 mm) on R2A medium after 3 days. On the basis of 16S rRNA gene sequence similarity, strain Jip08(T) was shown to belong to the alpha-2 subclass of the Proteobacteria, and was most closely related to Starkeya novella IAM 12100(T) (98.6 %), Angulomicrobium tetraedale DSM 5895(T) (98.1 %), Angulomicrobium amanitiforme NCIMB 1785(T) (98.0 %), Ancylobacter aquaticus ATCC 25396(T) (96.6 %) and Methylorhabdus multivorans DM13(T) (95.8 %), all of which belong to the family Hyphomicrobiaceae. The genomic DNA G+C content of strain Jip08(T) was 69 mol%. Chemotaxonomic data [major ubiquinone, Q-10; major fatty acids, C(18 : 1) isomer (summed feature of C(18 : 1)omega7c/omega9t/omega12t), C(19 : 0) cyclo omega8c and C(16 : 0)], 16S rRNA gene sequence analyses and some morphological and physiological features supported the affiliation of strain Jip08(T) to the genus Starkeya. However, DNA-DNA hybridization data and some phenotypic properties showed that strain Jip08(T) could be distinguished from the single known Starkeya species and represented a novel species, for which the name Starkeya koreensis sp. nov. is proposed. The type strain is Jip08(T) (=KCTC 12212(T)=NBRC 100963(T)=IAM 15215(T)).

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