Taibaiella helva sp. nov., isolated from farmland soil in China.

A yellow-coloured bacterial strain, designated F-4, was isolated from a farmland soil sample from Qianshan, Anhui province, China. Strain F-4 was Gram-stain-negative, strictly aerobic, oval-shaped, motile (by gliding) and non-spore-forming. Growth occurred at 20-35 °C (optimum, 30 °C), at pH 6.0-8.0 (pH 7.0) and with 0-1.0 % (w/v) NaCl (0 %). Phylogenetic analysis based on 16S rRNA gene sequences showed that strain F-4 belonged to the genus Taibaiella. 16S rRNA gene sequence similarity values between strain F-4 and the type strains of the three recognized species of the genus Taibaiella, Taibaiella koreensis KACC 17171, Taibaiella soli KCTC 42277 and Taibaiella chishuiensis JCM 19637, were 98.1, 96.4 and 95.9 %, respectively. The predominant respiratory quinone was MK-7, with MK-8 as a minor component. The major polar lipids of strain F-4 were three unidentified lipids, two unidentified aminolipids, three unidentified phospholipids, an unidentified aminophospholipid and phosphatidylethanolamine. The major cellular fatty acids were iso-C15 : 0, iso-C15 : 1 G and iso-C17 : 0. The G+C content of the genomic DNA based on total genome calculations was 51.3 mol%. The major polyamine of strain F-4 was homospermidine. The average nucleotide identity and the digital DNA-DNA hybridization values for draft genomes between strain F-4 and strain THG-DT86 were 79.8 and 22.6 %, respectively. On the basis of the genotypic and phenotypic data presented here, strain F-4 represents a novel species of the genus Taibaiella, for which the name Taibaiella helva sp. nov. is proposed. The type strain is F-4 (=KCTC 62442=CGMCC 1.13562).