Sinomonas oryzagri sp. nov., a plant-growth- promoting bacterium isolated from rice paddy soil.

A novel strain of the genus Sinomonas, designated G460-2 T, was isolated from rice paddy soil. The cells of strain G460-2 T were Gram-positive, aerobic, and non-motile rods. The optimal growth conditions for this strain were observed at 30 °C and a pH of 7.0. Phylogenetic analysis based on 16S rRNA gene sequencing revealed that strain G460-2 T shared the highest sequence similarity (98.41%) with Sinomonas albida LC13T. The genomic DNA of strain G460-2 T had a G + C content of 68.6 mol%. The genome size was determined to be 4.4 Mbp, and the average nucleotide identity (ANI) with the closest related reference strains was 86.39%, which is below the species delineation threshold of 95%. Digital DNA-DNA hybridization (dDDH) calculations yielded a relatedness value of 32.0% with the nearest neighbor. The predominant respiratory quinone identified in strain G460-2 T was MK-9(H2). The major fatty acids were C15:0 anteiso (44.8%), C17:0 anteiso (28.7%), C15:0 iso (11.6%), and C16:0 iso (10.1%).