Sinomicrobium kalidii sp. nov., an indole-3-acetic acid-producing endophyte from a shoot of halophyte Kalidium cuspidatum

Corynebacterium kalidii sp. nov, an endophyte from a shoot of the halophyte Kalidium cuspidatum

A Gram-stain-positive, non-motile, rod-shaped bacterial strain designated LD5P10^T was isolated from a root of Kalidium cuspidatum, in Tumd Right Banner, Inner Mongolia, China. The strain grew at 4-40 ℃ (optimum 30 ℃), and pH 5.0-10.0 (optimum pH 8.0), and in the presence of 0-16.0% (w/v) NaCl (optimum 2.0%). The strain was positive for catalase, and urease, and negative for nitrate reduction, and oxidase. The phylogenetic trees based on the 16S rRNA gene sequences and the whole genome sequence both revealed that strain LD5P10^T clustered tightly with Corynebacterium glyciniphilum AJ 3170^T and shared 98.1, 98.1, and < 98.1% of the 16S rRNA gene sequence similarities with strains C. glyciniphilum AJ 3170^T, C. variabile DSM 20132^T, and all the other current type strains. Strain LD5P10^T contained MK-9 as the major respiratory quinone. Its major polar lipids were phosphatidylglycerol, diphosphatidylglycerol, phosphoglycolipid, two unidentified lipids, and two unidentified phospholipids. Its major fatty acids were C_16:0 and C_18:1 ω9c. The genomic DNA G + C content was 69.0%. The average nucleotide identity based on BLAST (ANIb), amino acid identity (AAI), and digital DNA-DNA hybridization (dDDH) values of strain LD5P10^T to C. glyciniphilum AJ 3170^T and C. variabile DSM 20132^T were 82.9 and 76.4%, 85.3 and 69.4%, and 25.8 and 20.9%, respectively. The phylogenetic, physiological, and phenotypic results allowed the discrimination of strain LD5P10^T from its phylogenetic relatives. Corynebacterium kalidii sp. nov. is, therefore, proposed with strain LD5P10^T (= CGMCC 1.19144^T = JCM 35048^T) as the type strain.