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Gracilibacillus ureilyticus sp. nov., a halotolerant bacterium from a saline-alkali soli

¹ College of Life Sciences, Zhejiang University;
² Second Institute of Oceanography, State Oceanic Administration;
³ Jiangsu University

⁴ E-mail: wumin{at}zju.edu.cn

A Gram-positive, halotolerant, neutrophilic and rod-shaped bacterium, strain MF38^T, was isolated from saline-alkali soli in China and subjected to a polyphasic taxonomic characterization. This isolate grew in the presence of 0-15 % (w/v) NaCl and at pH 6.5-8.5; optimum growth was observed with 3.0% (w/v) NaCl and at pH 7.0. Chemotaxonomic analysis showed MK-7 as predominant respiratory quinone, and anteiso-C_15:0, anteiso-C_17:0, iso-C_15:0, C_17:0 and C_16:0 as major fatty acids. The genomic DNA G + C content was 35.3 mol%. 16S rRNA gene sequence similarities of strain MF38^T with described Gracilibacillus species ranged from 95.3 to 97.7 %. Strain MF38^T exhibited the closest phylogenetic affinity to the type strain of G. dipsosauri with 97.7 % sequence similarity. The DNA-DNA reassociation values between strain MF38^T and G. dipsosauri DSM 11125^T was 45 %. On the basis of phenotypic and genotypic data, strain MF38^T represents a novel species of the genus Gracilibacillus, for which the name Gracilibacillus ureilyticus sp. nov. (type strain MF38^T = CGMCC 1.7727^T = JCM 15711^T) is proposed.