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Abstract

A Gram-stain-negative, red pigment-producing, aerobic, and rod-shaped bacterial strain (A2-2) was isolated from a bleached scleractinian coral (). Strain A2-2 grew with 1.0–7.0 % (w/v) NaCl (optimum, 3.0 %), at pH 6.0–11.0 (optimum, pH 8.0), and at 18–41 °C (optimum, 35 °C). Results of phylogenetic analysis based on 16S rRNA gene sequences suggested that strain A2-2 fell within the genus and was closely related to S2-4-1H (98.1 % sequence similarity) and SM1973 (98.0 % sequence similarity). The predominant cellular fatty acids of strain A2-2 were C (31.0 %), summed feature 3 (29.0 %), summed feature 8 (11.7 %), C 3-OH (6.4 %), and C 3-OH (5.5 %), while the major respiratory quinone was Q-9. The polar lipids mainly comprised phosphatidylethanolamine, phosphatidylglycerol, diphosphatidylglycerol, and an unidentified phospholipid. The genome size of strain A2-2 was 6.8 Mb, with a G+C content of 40.2 mol%. The DNA–DNA hybridization value was 24.2 % between A2-2 and S2-4-1H and 36.9 % between A2-2 and SM1973, while the average nucleotide identity values were 80.1 and 88.8 %, respectively. Based on these findings, strain A2-2 could be recognized to represent a novel species of the genus , for which the name sp. nov. is proposed. The type strain is A2-2 (=MCCC 1K08228=KCTC 8323).

Funding
This study was supported by the:
  • Natural Science Foundation of Shenzhen Municipality (Award JCYJ20200109144803833)
    • Principle Award Recipient: LinCai
  • National Key Research and Development Program of China (Award 2019YFE0198500)
    • Principle Award Recipient: LinCai
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2024-07-04
2024-07-23
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