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Rheinheimera tangshanensis sp. nov., a rice root-associated bacterium

¹ College of Life Sciences, Capital Normal University, Beijing 100048, PR China
² Agricultural Cultural Collection of China, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, PR China
³ College of Life Sciences, Hebei University, Baoding 071002, PR China
⁴ School of Public Health, Shanxi Medical University, Taiyuan 030001, PR China
⁵ Department of Biology, Texas State University – San Marcos, 601 University Drive, San Marcos, TX 78666, USA

Correspondence
Wei Song
songwei{at}mail.cnu.edu.cn

A Gram-negative, aerobic, rod-shaped bacterium, designated strain JA3-B52^T, was isolated from the roots of fresh rice plants (Oryza sativa). The cells were motile by means of polar single or lateral flagella. The colonies were non-pigmented. On the basis of 16S rRNA gene sequence comparisons, the strain was phylogenetically related to species of the genus Rheinheimera, having the greatest level of sequence similarity with respect to Rheinheimera texasensis A62-14B^T (97.16 %). The bacterium grew at temperatures from 10 to 37 °C, with an optimum at 30 °C. The strain exhibited growth with 0–3.0 % (w/v) NaCl and at pH 6.0–8.5. The main cellular fatty acids were C_{16 : 1}7c, C_{17 : 1}8c, C _{16 : 0}, C_{18 : 1}7c and C_{12 : 0} 3-OH. The DNA G+C content was 47.0 mol%. The levels of similarity between the 16S rRNA gene sequence of strain JA3-B52^T and those of the type strains of Rheinheimera species ranged from 95.38 to 97.16 %. The mean level of DNA–DNA relatedness between strain JA3-B52^T and R. texasensis A62-14B^T, the strain most closely related to the isolate, was 20.4 %. On the basis of physiological and biochemical characteristics and genotypic data obtained in this work, strain JA3-B52^T represents a novel species of the genus Rheinheimera, for which the name Rheinheimera tangshanensis sp. nov. is proposed. The type strain is JA3-B52^T (=CGMCC 1.6362^T =DSM 19460^T).