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Gracilibacillus marinus sp. nov., isolated from the northern South China Sea

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Abstract

Two gram-positive, aerobic, spore-forming, rod-shaped bacteria, designated HB09003T and HB12160, were isolated from seawater and sediment in the northern South China Sea, respectively. Cells were found to be motile by means of peritrichous flagella. The strains were found to grow with 0–15 % (w/v) NaCl, at 10–45 °C and pH 5.0–10.7, with an optimum of 3 % NaCl, 28 °C and pH 8.5, respectively. The predominant isoprenoid quinone of strain HB09003T, selected as the representative strain, was identified as MK-7. This strain was found to possess anteiso-C15:0, iso-C15:0, anteiso-C17:0 and C16:0 as the major fatty acids. The G+C contents of strain HB09003T and HB12160 were determined to be 34.1 and 34.3 mol%, respectively. Analysis of the 16S rRNA gene sequences of the two strains showed an affiliation with the genus Gracilibacillus, with Gracilibacillus kekensis CGMCC 1.10681T (similarity of 97.4, 98.0 %, respectively) and Gracilibacillus ureilyticus CGMCC 1.7727T (similarity of 97.1, 97.8 %, respectively) as their closest relatives. The DNA–DNA hybridization values between strain HB09003T and the two type strains were 42.2 and 54.1 %, respectively. On the basis of phenotypic and genotypic data, strain HB09003T and HB12160 are proposed to represent a novel species of the genus Gracilibacillus, for which the name Gracilibacillus marinus sp. nov. is proposed. The type strain is HB09003T (=CGMCC 1.10343T = DSM 23372T).

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Abbreviations

MK:

Menaquinone

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Acknowledgments

We acknowledge the help of M Wu and S F Chen for offering the related two strains. This research was supported by grants from Haninan Major Technology Project (ZDZX2013023-1), the Foundation of Chinese National Program for High Technology Research and Development (2007AA09Z447) and National Non-profit Institute Research Grant of CATAS-ITBB from Chinese Government (1630052013004).

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Correspondence to Shi-xiang Bao.

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Supplementary Fig. S1

Scanning electron micrograph of cells from a 7-day-old culture of strain HB09003T grown on modified R2A agar at 28 °C. Bar 5 μm. (JPEG 25 kb)

Supplementary Fig. S2

Micrograph of strain HB09003T showing spore-forming rods. (JPEG 20 kb)

Supplementary Fig. S3

The polar lipids of strain HB09003T assayed by TLC plate method. The polar liquids consist of DPG diphosphatidylglycerol, PG phosphatidylglycerol, NPG unidentified phospholipids, AL amino-polar lipid and GL glycolipids. (JPEG 10 kb)

Supplementary Fig. S4

Maximum parsimony tree showing the relationship between strain HB09003T, HB12160 and the type strains of genus Gracilibacillus. Bootstrap values (1,000 replicates) are shown as percentages at each node for values; values > 50 % were shown. The scale bar represents 0.005 nucleotide substitutions per position. (DOC 42 kb)

Supplementary Fig. S5

Maximum likelihood tree showing the relationship between strain HB09003T, HB12160 and the type strains of genus Gracilibacillus. Bootstrap values (1,000 replicates) are shown as percentages at each node for values; values > 50 % were shown. The scale bar represents 0.005 nucleotide substitutions per position. (DOC 42 kb)

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Huang, Hq., Wang, Y., Yuan, Wd. et al. Gracilibacillus marinus sp. nov., isolated from the northern South China Sea. Antonie van Leeuwenhoek 104, 695–701 (2013). https://doi.org/10.1007/s10482-013-9977-2

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