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Abstract
A Gram-stain-negative, facultatively anaerobic, flagellated and rod-shaped bacterium, designated strain SM1901T, was isolated from a brown algal sample collected from Kings Bay, Svalbard, Arctic. Strain SM1901T grew at −4‒30 °C and with 0–7.0 % (w/v) NaCl. It reduced nitrate to nitrite and hydrolysed DNA and Tween 80. Results of phylogenetic analyses based on 16S rRNA gene sequences indicated that strain SM1901T was affiliated with the genus Shewanella , showing the highest sequence similarity to the type strain of Shewanella litoralis (97.5%), followed by those of Shewanella vesiculosa , Shewanella livingstonensis and Shewanella saliphila (97.3 % for all three). The major cellular fatty acids were summed feature 3 (C16 : 1 ω7с and/or C16 : 1 ω6с), C16 : 0, C18 : 0, iso-C15 : 0 and C17 : 1 ω8с and the major polar lipids were phosphatidylethanolamine and phosphatidylglycerol. The respiratory quinones were ubiquinones Q-7, Q-8, menaquinones MK-7(H) and MK-8. The genome of strain SM1901T was 4648537 nucleotides long and encoded a variety of cold adaptation related genes, providing clues for better understanding the ecological adaptation mechanisms of polar bacteria. The genomic DNA G+C content of strain SM1901T was 40.5 mol%. Based on the polyphasic evidence presented in this paper, strain SM1901T was considered to represent a novel species, constituting a novel psychrotolerant lineage out of the known SF clade encompassed by polar Shewanella species, within the genus Shewanella , for which the name Shewanella polaris sp. nov. is proposed. The type strain is SM1901T (=KCTC 72047T=MCCC 1K03585T).
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Funding
- the scholarship under the State Scholarship Fund issued by China Scholarship Council (Award file No. 201906225012)
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the Science and Technology Basic Resources Investigation Program of China
(Award 2017FY100804)
- Principle Award Recipient: Xi-Ying Zhang
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Taishan Scholars Program of Shandong Province
(Award tspd20181203)
- Principle Award Recipient: Yu-Zhong Zhang
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AoShan Talents Cultivation Program Supported by Qingdao National Laboratory for Marine Science and Technology
(Award 2017ASTCP-OS14)
- Principle Award Recipient: Yu-Zhong Zhang
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National Key R&D Program of China
(Award 2018YFC1406704)
- Principle Award Recipient: Xi-Ying Zhang
- National Key R&D Program of China (Award 2018YFC1406703)
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National Key R&D Program of China
(Award 2018YFC1406701)
- Principle Award Recipient: Hai-Nan Su
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National Key R&D Program of China
(Award 2018YFC0310704)
- Principle Award Recipient: Xiu-Lan Chen
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National Key R&D Program of China
(Award 2018YFC1406504)
- Principle Award Recipient: Xiao-Yan Song
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the National Science Foundation of China
(Award 31870052)
- Principle Award Recipient: Xiu-Lan Chen
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the National Science Foundation of China
(Award 31670063)
- Principle Award Recipient: Xi-Ying Zhang