Trinickia diaoshuihuensis sp. nov., a plant growth promoting bacterium isolated from soil.

A novel Gram-stain-negative, aerobic, rod-shaped plant growth promoting bacterium, NEAU-SY24T , was isolated from soil in Diaoshuihu, Heilongjiang, China. The isolate grew at temperatures 10-40 °C (optimum, 30 °C), pH 5-8 (optimum, pH 6) and in the presence of up to 1 % (w/v) NaCl, although NaCl was not required for growth. Phylogenetic analysis based on the 16S rRNA gene sequence indicated that strain NEAU-SY24T belonged to the genus Trinickia and was closely related to Trinickia dabaoshanensis NRRL B-59553T (99.16 % similarity) and Trinickia soli DSM 18235T (99.11 %). The average nucleotide identity values between NEAU-SY24T and its most closely related species were 79.30-87.09 %. The in silico DNA-DNA hybridization values between NEAU-SY24T and T. dabaoshanensis NRRL B-59553T and T. soli DSM 18235T were 29.30 and 24.00 %, respectively, again indicating they belong to different taxa. The genomic DNA G+C content was 63.3 mol%. The major cellular fatty acids were C17 : 0cyclo, C18 : 1ω7c, C16 : 0, summed feature 2 (comprising C14 : 0 3-OH and/or C16 : 1iso I) and C16 : 0 3-OH. The predominant respiratory quinone was Q-8 and the whole-cell sugars contained ribose, glucose and galactose. The polar lipids consisted of diphosphatidylglycerol, phosphatidylglycerol, phosphatidylethanolamine, hydroxyphosphatidylethanolamine and two unidentified aminolipids. On the basis of morphological, physiological, biochemical and chemotaxonomic analysis, strain NEAU-SY24T was classified as a novel species in the genus Trinickia, for which the name Trinickiadiaoshuihuensis sp. nov. is proposed. The type strain is NEAU-SY24T (=DSM 106065T =CCTCC AA 2018003T ).