1887

Abstract

A novel bacterial strain, J103, was isolated from rhizosphere soil of the mangrove plant Kandelia in Mai Po Inner Deep Bay Ramsar Site, Hong Kong. The strain was aerobic, Gram-stain-negative, oval-shaped with folds in the middle, non-motile and non-spore-forming. It grew at temperatures of 20–30 °C (optimum, 25–30 °C), at pH 6.0–9.0 (optimum pH 6.0) and at NaCl concentrations of 0.5–5.0 % (w/v) (optimum 1.0–2.0 %). Strain J103 was able to reduce nitrate to nitrite, and hydrolyse urea, Tween 40 and Tween 60. The major polar lipids were aminolipid, glycolipid, phosphatidylcholine and phosphatidylglycerol. The major fatty acids were C18 : 1 ω7c and C19 : 0 cyclo ω8c. The respiratory quinone was Q-10. The DNA G+C content was 68.5 mol%. Sequence analysis of the 16S rRNA gene indicated that strain J103 belongs to the genus Acuticoccus , within the family Rhodobacteraceae . The closest phylogenetic neighbour was Acuticoccus yangtzensis JL1095, showing 96.2 % 16S rRNA gene sequence similarity. The genome size of strain J103 was 6 478 100 bp. The average nucleotide identity and digital DNA–DNA hybridization values between strain J103 and Acuticoccus yangtzensis JL1095 were 75.44 and 16.43 %, respectively. Characterization based on phylogenetic, phenotypic, chemotaxonomic and genomic evidence demonstrated that strain J103 represents a novel species of the genus Acuticoccus , for which the name Acuticoccus kandeliae sp. nov. is proposed. The type strain is J103 (=DSM 104434=MCCC 1K03288).

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2018-08-24
2019-12-15
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