title: Multilocus sequence analysis for assessment of phylogenetic diversity and biogeography in Thalassospira bacteria from diverse marine environments.
abstract: Thalassospira bacteria are widespread and have been isolated from various marine environments. Less is known about their genetic diversity and biogeography, as well as their role in marine environments, many of them cannot be discriminated merely using the 16S rRNA gene. To address these issues, in this report, the phylogenetic analysis of 58 strains from seawater and deep sea sediments were carried out using the multilocus sequence analysis (MLSA) based on acsA, aroE, gyrB, mutL, rpoD and trpB genes, and the DNA-DNA hybridization (DDH) and average nucleotide identity (ANI) based on genome sequences. The MLSA analysis demonstrated that the 58 strains were clearly separated into 15 lineages, corresponding to seven validly described species and eight potential novel species. The DDH and ANI values further confirmed the validity of the MLSA analysis and eight potential novel species. The MLSA interspecies gap of the genus Thalassospira was determined to be 96.16-97.12% sequence identity on the basis of the combined analyses of the DDH and MLSA, while the ANIm interspecies gap was 95.76-97.20% based on the in silico DDH analysis. Meanwhile, phylogenetic analyses showed that the Thalassospira bacteria exhibited distribution pattern to a certain degree according to geographic regions. Moreover, they clustered together according to the habitats depth. For short, the phylogenetic analyses and biogeography of the Thalassospira bacteria were systematically investigated for the first time. These results will be helpful to explore further their ecological role and adaptive evolution in marine environments.
authors.affiliation: State Key Laboratory Breeding Base of Marine Genetic Resources, Xiamen, China; Key Laboratory of Marine Genetic Resources, Third Institute of Oceanography, SOA, Xiamen, China; Key Laboratory of Marine Genetic Resources of Fujian Province, Xiamen, China; Collaborative Innovation Center of Deep Sea Biology, Xiamen, China; Fujian Collaborative Innovation Center for Exploitation and Utilization of Marine Biological Resources, Xiamen, China.
authors.forename: Qiliang
authors.initials: Q
authors.lastname: Lai
authors.affiliation: State Key Laboratory Breeding Base of Marine Genetic Resources, Xiamen, China; Key Laboratory of Marine Genetic Resources, Third Institute of Oceanography, SOA, Xiamen, China; Key Laboratory of Marine Genetic Resources of Fujian Province, Xiamen, China; Collaborative Innovation Center of Deep Sea Biology, Xiamen, China; Fujian Collaborative Innovation Center for Exploitation and Utilization of Marine Biological Resources, Xiamen, China.
authors.forename: Yang
authors.initials: Y
authors.lastname: Liu
authors.affiliation: State Key Laboratory Breeding Base of Marine Genetic Resources, Xiamen, China; Key Laboratory of Marine Genetic Resources, Third Institute of Oceanography, SOA, Xiamen, China; Key Laboratory of Marine Genetic Resources of Fujian Province, Xiamen, China; Collaborative Innovation Center of Deep Sea Biology, Xiamen, China; Fujian Collaborative Innovation Center for Exploitation and Utilization of Marine Biological Resources, Xiamen, China.
authors.forename: Jun
authors.initials: J
authors.lastname: Yuan
authors.affiliation: State Key Laboratory Breeding Base of Marine Genetic Resources, Xiamen, China; Key Laboratory of Marine Genetic Resources, Third Institute of Oceanography, SOA, Xiamen, China; Key Laboratory of Marine Genetic Resources of Fujian Province, Xiamen, China; Collaborative Innovation Center of Deep Sea Biology, Xiamen, China; Fujian Collaborative Innovation Center for Exploitation and Utilization of Marine Biological Resources, Xiamen, China.
authors.forename: Juan
authors.initials: J
authors.lastname: Du
authors.affiliation: State Key Laboratory Breeding Base of Marine Genetic Resources, Xiamen, China; Key Laboratory of Marine Genetic Resources, Third Institute of Oceanography, SOA, Xiamen, China; Key Laboratory of Marine Genetic Resources of Fujian Province, Xiamen, China; Collaborative Innovation Center of Deep Sea Biology, Xiamen, China; Fujian Collaborative Innovation Center for Exploitation and Utilization of Marine Biological Resources, Xiamen, China.
authors.forename: Liping
authors.initials: L
authors.lastname: Wang
authors.affiliation: State Key Laboratory Breeding Base of Marine Genetic Resources, Xiamen, China; Key Laboratory of Marine Genetic Resources, Third Institute of Oceanography, SOA, Xiamen, China; Key Laboratory of Marine Genetic Resources of Fujian Province, Xiamen, China; Collaborative Innovation Center of Deep Sea Biology, Xiamen, China; Fujian Collaborative Innovation Center for Exploitation and Utilization of Marine Biological Resources, Xiamen, China.
authors.forename: Fengqin
authors.initials: F
authors.lastname: Sun
authors.affiliation: State Key Laboratory Breeding Base of Marine Genetic Resources, Xiamen, China; Key Laboratory of Marine Genetic Resources, Third Institute of Oceanography, SOA, Xiamen, China; Key Laboratory of Marine Genetic Resources of Fujian Province, Xiamen, China; Collaborative Innovation Center of Deep Sea Biology, Xiamen, China; Fujian Collaborative Innovation Center for Exploitation and Utilization of Marine Biological Resources, Xiamen, China.
authors.forename: Zongze
authors.initials: Z
authors.lastname: Shao
mesh_terms: D044822:Biodiversity; D005798:Genes, Bacterial; D008386:Marine Biology; D058974:Phylogeography; D012244:Rhodospirillaceae / Q000145:classification* / Q000235:genetics