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Virgibacillus chiguensis sp. nov., a novel halophilic bacterium isolated from Chigu, a previously commercial saltern located in southern Taiwan

¹ Department of Horticulture, National Taiwan University, 140 Keelung Road Section 4, Taipei 106, Taiwan, ROC
² Department of Home Economics, Tainan University of Technology, 529 Jhongjheng Road, Yongkang, Tainan 71002, Taiwan, ROC

Correspondence
Yuan-Tay Shyu
tedshyu{at}ntu.edu.tw

A Gram-positive, motile, endospore-forming, irregular rod-shaped (0.7–0.9x2.5–5.0 µm), halophilic bacterial strain, NTU-101^T, was isolated from Chigu saltern in southern Taiwan, previously used as a salt production field. The isolate was characterized taxonomically based on biochemical and molecular approaches. It grows optimally at 40 °C and in the presence of 5–10 % NaCl. Strain NTU-101^T has cell-wall peptidoglycan based on meso-diaminopimelic acid and MK-7 as the predominant menaquinone. Major polar lipids are phosphatidylglycerol, diphosphatidylglycerol and phosphatidylethanolamine. Anteiso-C_{15 : 0}, iso-C_{15 : 0} and anteiso-C_{17 : 0} are the major fatty acids. The DNA G+C content was 37.3 mol%. Phylogenetic analyses based on 16S rRNA gene sequences showed its affiliation to the genus Virgibacillus. DNA–DNA relatedness values between strain NTU-101^T and Virgibacillus dokdonensis and Virgibacillus pantothenticus were 17.5 and 21.5 %, respectively. Based on the phenotypic and phylogenetic properties, strain NTU-101^T (=BCRC 17637^T=CGMCC 1.6496^T) was classified as a novel strain of Virgibacillus species, for which the name Virgibacillus chiguensis sp. nov. is proposed.

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