Jiella pacifica sp. nov., isolated from the West Pacific Ocean

Jiella pelagia sp. nov., isolated from the phosphonate-amended seawater of the northwestern Pacific Ocean

A novel Gram-stain-negative, aerobic, rod-shaped bacterium, designated as HL-NP1T, was isolated from the surface water of the northwestern Pacific Ocean after enrichment cultivation using the organic phosphorous compound of 2-aminoethylphosphonate. Phylogenetic analysis based on 16S rRNA gene sequences showed that the strain belonged to the genus Jiella, with the highest similarity to Jiella pacifica 40Bstr34T (98.7 %). The complete genome sequence of strain HL-NP1T comprised a circular chromosome of 5.58 Mbp and two circular plasmids of 0.15 and 0.22 Mbp. Comparison of the genome sequences between strains HL-NP1T and J. pacifica 40Bstr34T revealed that average nucleotide identity, average amino acid identity and digital DNA-DNA hybridization values (88.0, 86.4 and 33.9 %, respectively) were below the recommended cut-off levels for delineating bacterial species. Strain HL-NP1T showed optimal growth at 30 °C, pH 6.5-7.0, with 2.0-2.5 % (w/v) NaCl. The sole respiratory quinone was ubiquinone-10. The predominant fatty acid was summed feature 8 (C18 : 1  ω6c and/or C18 : 1  ω7c). The polar lipids comprised diphosphatidylglycerol, phosphatidylcholine, phosphatidylethanolamine, phosphatidylglycerol, phosphatidylmonomethylethanolamine, an unidentified aminolipid and four unidentified lipids. The G+C content of the genomic DNA was 65.1 %. Based on phylogenetic, genotypic, phenotypic and chemotaxonomic data, strain HL-NP1T is proposed to represent a novel species of the genus Jiella, for which the name Jiella pelagia sp. nov. is proposed. The type strain is HL-NP1T (= KCCM 90499T = JCM 35838T).

Description and genomic characterization of Jiella flava sp. nov., isolated from Acrostichum aureum

Two endophytic bacteria, designated strains CQZ9-1T and MQZ9-1, were isolated from semi-mangrove plant Acrostichum aureum collected from Maowei Sea Mangrove Nature Reserve in Guangxi Zhuang Autonomous Region, PR China. The two strains possessed almost identical 16S rRNA gene sequences (99.7 %). The average nucleotide identity (ANI), average amino acid identity (AAI) and the digital DNA-DNA hybridization (dDDH) values between the two strains were 100 %, indicating that they represented the same species. The 16S rRNA gene sequence similarities between strains CQZ9-1T, MQZ9-1 and the most closely related type strains, Jiella mangrovi KSK16Y-1T, Jiella sonneratiae MQZ13P-4T and Jiella endophytica CBS 5Q-3T were 98.0–98.1, 97.3–97.4 and 97.3–97.4 %, respectively. The results of phylogenetic analyses based on 16S rRNA gene sequences and genome sequences indicated that CQZ9-1T and MQZ9-1 formed a distinct lineage with J. endophytica CBS5Q-3T, Jiella pacifica 40Bstr34T, J. mangrovi KSK16Y-1T, J. sonneratiae MQZ13P-4T, Jiella aquimaris JCM 30119T and J. aquimaris 22II-16-19i. The draft genomes of strains CQZ9-1T and MQZ9-1 were 4  162  933 bp and 4  164  266 bp in size, respectively, and their DNA G+C contents were both 63.8 %. Comparative genome analysis of the two strains and the type strains of related species revealed ANI, AAI and dDDH values below the cut-off levels of 95-96, 95.5 and 70 %, respectively. The ubiquinone detected in CQZ9-1T was Q-10. The major cellular fatty acid of strains CQZ9-1T and MQZ9-1 was found to be C18:1ω7c. Combined data from phenotypic, phylogenetic and chemotaxonomic studies indicated that CQZ9-1T and MQZ9-1 represent a novel species of the genus Jiella , for which the name Jiella flava sp. nov. is proposed. The type strain is CQZ9-1T (= CGMCC 1.18725T = JCM 34331T).

Jiella sonneratiae sp. nov., a novel endophytic bacterium isolated from bark of Sonneratia apetala

A new endophytic bacterium, designated strain MQZ13P-4T was isolated from Sonneratia apetala collected from Maowei sea Mangrove Nature Reserve in Guangxi Zhuang Autonomous Region, PR China. The 16S rRNA gene sequence similarity between strain MQZ13P-4T and its closest phylogenetic neighbour Jiella endophytica CBS5Q-3T was 97.9 %. Phylogenetic analyses using 16S rRNA gene sequences and whole-genome sequences showed that strain MQZ13P-4T formed a distinct lineage with Jiella endophytica CBS5Q-3T, Jiella pacifica 40Bstr34T and Jiella aquimaris JCM 30119T. The draft genome of strain MQZ13P-4T was 5 153 243 bp in size and its DNA G+C content was 68.1 mol%. Comparative genome analysis revealed that the average nucleotide identity, digital DNA–DNA hybridization and average amino acid identity values among strain MQZ13P-4T and other related species were below the cut-off levels of 95, 70 and 95.5 %, respectively. The cell-wall peptidoglycan of strain MQZ13P-4T contained meso-diaminopimelic acid as the diagnostic diamino acid. The respiratory quinone was Q-10. The major cellular fatty acid was C18 : 1  ω7c. The polar lipids comprised phosphatidylcholine, phosphatidylethanolamine, phosphatidylmonomethylethanolamine, phosphatidylglycerol, diphosphatidylglycerol, two unidentified aminolipids and two unidentified lipids. Strain MQZ13P-4T had a typical chemical compositions of fatty acids, lipids, quinones and diagnostic diamino acid for Jiella species, but could be distinguished from known species of the genus Jiella . Based on polyphasic evidence, strain MQZ13P-4T represents novel species of the genus Jiella , for which the name Jiella sonneratiae sp. nov. is proposed. The type strain is MQZ13P-4T (=CGMCC 1.18727T=JCM 34333T).

Jiella mangrovi sp. nov., a novel endophytic bacterium isolated from leaf of Rhizophora stylosa

A Gram-stain negative, non-motile, brilliant yellow and non-spore forming, coccoid- or short rod-shaped bacterium, designated strain KSK16Y-1^T, was isolated from surface-sterilised leaf of Rhizophora stylosa collected from Shankou Mangrove Nature Reserve, Guangxi Zhuang Autonomous Region, China. Genome of strain KSK16Y-1^T is 4.93 Mb with 68.1% DNA G + C content and encoded 4359 predicted proteins, 4 rRNAs, 45 tRNAs and 4 ncRNA. Comparative 16S rRNA gene sequence analysis showed that the strain KSK16Y-1^T has 98.1%, 97.9% and 96.9% 16S rRNA gene similarities with Jiella aquimaris JCM 30119^T, J. endophytica CBS5Q-3^T and J. pacifica 40Bstr34^T, respectively. Whole-genome comparisons between strain KSK16Y-1^T and J. aquimaris 22II-16-19i, J. endophytica CBS5Q-3^T, J. pacifica 40Bstr34^T, using average nucleotide identity (ANI) values (< 82.0%) and digital DNA-DNA hybridization (dDDH) values (< 25.1%), confirmed low genome relatedness. Strain KSK16Y-1^T grew at 20-30 °C (optimum, 30 °C), pH 6.0-11.0 (optimum, pH 6.0-7.0) and with 0-10% (w/v) NaCl (optimum, 0-2%). Cell wall contained meso-diaminopimelic acid and the major fatty acid was C_18:1ω7c. The polar lipid profile consists of phosphatidylcholine, phosphatidylglycerol, diphosphatidylglycerol, phosphatidylethanolamine, phosphatidylmonomethylethanolamine, one unknown phospholipid, one unknown aminolipid, one unknown aminophospholipid and four unidentified lipids. The predominant respiratory quinone is ubiquinone-10 (Q-10). The polyphasic characterization indicated that strain KSK16Y-1^T represents a novel Jiella species. The name Jiella mangrovi sp. nov., type strain KSK16Y-1^T (= CGMCC 1.18745^T = JCM 34332^T) is proposed.