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Ajit Kumar Patra,조현희,권용민,권개경,Takako Sato,Chiaki Kato,강성균,김상진 한국해양과학기술원 2016 Ocean science journal Vol.51 No.3
Vestimentiferan tubeworms acquire their symbionts through horizontal transmission from the surrounding environment. In the present study, we constructed a 16S rRNA gene clone library to investigate the phylogenetic relationship between diverse microbes in the sediment and symbiotic bacteria in the trophosome of the tubeworm, Lamellibrachia satsuma, from Kagoshima Bay, Japan. Two symbiotic bacterial phylotypes belonging to the classes γ- and ε-Proteobacteria were found from this tubeworm trophosome. They were very closely related to the symbionts of several other marine invertebrates. The most predominant bacteria in the sediment were ε-Proteobacteria. A broad diversity of bacteria belonged to nonproteobacterial phyla such as Planctomycetes, Acidobacteria, and Chloroflexi was observed. The presence of sulfur oxidizers (i.e., ε-Proteobacteria and γ-Proteobacteria) and sulfur reducers (i.e., δ-Proteobacteria) may play a significant role in the sulfur cycle in these habitats and provide multiple sources of nutrition to the cold-seep communities. Closely related clones of ε-Proteobacteria symbiont in the species level and of γ-Proteobacteria symbiont in the genus level were found in the surrounding sediment. The similarity of symbiont clones of L. satsuma with other symbionts and free-living bacteria suggests the possibility of opportunistic symbiosis in ε-Proteobacteria and the co-evolution of γ-Proteobacteria having occurred after symbiosis with the tubeworms.
Patra, Ajit Kumar,Cho, Hyun Hee,Kwon, Yong Min,Kwon, Kae Kyoung,Sato, Takako,Kato, Chiaki,Kang, Sung Gyun,Kim, Sang-Jin Korean Ocean Research & Development Institute and 2016 OCEAN SCIENCE JOURNAL Vol.51 No.3
Vestimentiferan tubeworms acquire their symbionts through horizontal transmission from the surrounding environment. In the present study, we constructed a 16S rRNA gene clone library to investigate the phylogenetic relationship between diverse microbes in the sediment and symbiotic bacteria in the trophosome of the tubeworm, Lamellibrachia satsuma, from Kagoshima Bay, Japan. Two symbiotic bacterial phylotypes belonging to the classes <TEX>${\gamma}$</TEX>- and <TEX>${\varepsilon}$</TEX>-Proteobacteria were found from this tubeworm trophosome. They were very closely related to the symbionts of several other marine invertebrates. The most predominant bacteria in the sediment were <TEX>${\varepsilon}$</TEX>-Proteobacteria. A broad diversity of bacteria belonged to non-proteobacterial phyla such as Planctomycetes, Acidobacteria, and Chloroflexi was observed. The presence of sulfur oxidizers (i.e., <TEX>${\varepsilon}$</TEX>-Proteobacteria and <TEX>${\gamma}$</TEX>-Proteobacteria) and sulfur reducers (i.e., <TEX>${\delta}$</TEX>-Proteobacteria) may play a significant role in the sulfur cycle in these habitats and provide multiple sources of nutrition to the cold-seep communities. Closely related clones of <TEX>${\varepsilon}$</TEX>-Proteobacteria symbiont in the species level and of <TEX>${\gamma}$</TEX>-Proteobacteria symbiont in the genus level were found in the surrounding sediment. The similarity of symbiont clones of L. satsuma with other symbionts and free-living bacteria suggests the possibility of opportunistic symbiosis in <TEX>${\varepsilon}$</TEX>-Proteobacteria and the co-evolution of <TEX>${\gamma}$</TEX>-Proteobacteria having occurred after symbiosis with the tubeworms.