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Piscibacillus salipiscarius gen. nov., sp. nov., a moderately halophilic bacterium from fermented fish (pla-ra) in Thailand

¹ Department of Microbiology, Faculty of Pharmaceutical Sciences, Chulalongkorn University, Bangkok 10330, Thailand
² Faculty of Science & Technology, Suan Sunandha Rajabhat University, Bangkok 10300, Thailand
³ Japan Collection of Microorganisms, RIKEN BioResource Center, Wako-shi, Saitama 351-0198, Japan

Correspondence
Somboon Tanasupawat
Somboon.T{at}chula.ac.th

A Gram-positive, spore-forming and moderately halophilic bacterium was isolated from fermented fish (pla-ra) in Thailand. Cells of the isolate, RBU1-1^T, were strictly aerobic, motile rods and contained meso-diaminopimelic acid in the cell-wall peptidoglycan. Menaquinone with seven isoprene units (MK-7) was the predominant quinone. This isolate grew at 15–48 °C, pH 5–9 and in 2–30 % NaCl (optimally 10–20 %). The major cellular fatty acids were iso-C_{15 : 0} and anteiso-C_{15 : 0}. Polar lipid analysis revealed the presence of phosphatidylglycerol and diphosphatidylglycerol. The DNA G+C content was 36.7 mol%. 16S rRNA gene sequence analysis revealed that strain RBU1-1^T was a member of the family Bacillaceae, and belonged to a cluster with Filobacillus and Tenuibacillus; strain RBU1-1^T showed 16S rRNA gene sequence similarities of 96.0–96.9 % to members of these two genera. Strain RBU1-1^T could also be differentiated from members of the genera Filobacillus and Tenuibacillus based on certain phenotypic characteristics such as cell-wall composition, mode of flagellation and growth pH range. Therefore, strain RBU1-1^T is considered to represent a novel species in a new genus in the family Bacillaceae, for which the name Piscibacillus salipiscarius gen. nov., sp. nov. is proposed. The type strain of Piscibacillus salipiscarius is RBU1-1^T (=JCM 13188^T=PCU 270^T=TISTR 1571^T).

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of RBU1-1^T is AB194046.

A chromatogram of the polar lipids of strain RBU1-1^T is available as a supplementary figure with the online version of this paper.

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