Phylogenetic similarity of aerobic gram-negative halophilic bacteria from a deep-sea hydrothermal mound and Antarctic habitats

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Deep-sea halophilic strains, 4 halomonads and 1 pseudoalteromonad, were isolated from high-temperature hydrothermal fluids of the TAG hydrothermal mound in the Mid-Atlantic Ridge. Two of the TAG halomonads were closely related to Antarctic halomonads based on 16S rDNA sequences (1350bp). Subhydrothermal vents and Antarctic terrains are known to provide high-salinity habitats for halophilic life. The TAG-Antarctic halomonad kinship indicates the wide distribution of halophiles over globally distant habitats, regardless of large differences in temperatures of the habitats. This suggests that microbial eco-physiology in Antarctica (and sub-hydrothermal vent), which has been studied in terms of temperature adapation, may be complemented by halotolerance and halophilism studies.
国立極地研究所の論文