Deep-sea hydrothermal vents are known as chemosynthetic ecosystems.However,high temperature vents emit light that hypothetically can drive photosynthesis in this habitat.Metagenomic studies have sporadically reported ...Deep-sea hydrothermal vents are known as chemosynthetic ecosystems.However,high temperature vents emit light that hypothetically can drive photosynthesis in this habitat.Metagenomic studies have sporadically reported the occurrence of phototrophic populations such as cyanobacteria in hydrothermal vents.To determine how geographically and taxonomically widespread phototrophs are in deep-sea hydrothermal vents,we collected samples from three niches in a hydrothermal vent on the Southwest Indian Ridge and carried out an integrated metagenomic analysis.We determined the typical community structures of microorganisms found in active venting fields and identified populations of known potential chlorophototrophs and retinalophototrophs.Complete chlorophyll biosynthetic pathways were identified in all samples.By contrast,proteorhodopsins were only found in active beehive smoker diffusers.Taxonomic groups possessing potential phototrophy dependent on semiconductors present in hydrothermal vents were also found in these samples.This systematic comparative metagenomic study reveals the widespread distribution of phototrophic bacteria in hydrothermal vent fields.Our results support the hypothesis that the ocean is a seed bank of diverse microorganisms.Geothermal vent light may provide energy and confer a competitive advantage on phototrophs to proliferate in hydrothermal vent ecosystems.展开更多
基金supported by the National Key Research and Development Program of China(No.2018YFC0309904)the National Natural Science Foundation of China(Nos.91751202,41806174,91751108)+3 种基金the Key Research and Development Program of Hainan Province(No.ZDKJ2019011)Grant Y9719105 from the Institute of Deep-sea Technology Innovation,Chinese Academy of Sciences(IDSTI-CAS)Grant 2019YD16 from Sanya City and Grant INSB-DBM2021support to LIA-MagMC from Centre National de la Recherche Scientifique.
文摘Deep-sea hydrothermal vents are known as chemosynthetic ecosystems.However,high temperature vents emit light that hypothetically can drive photosynthesis in this habitat.Metagenomic studies have sporadically reported the occurrence of phototrophic populations such as cyanobacteria in hydrothermal vents.To determine how geographically and taxonomically widespread phototrophs are in deep-sea hydrothermal vents,we collected samples from three niches in a hydrothermal vent on the Southwest Indian Ridge and carried out an integrated metagenomic analysis.We determined the typical community structures of microorganisms found in active venting fields and identified populations of known potential chlorophototrophs and retinalophototrophs.Complete chlorophyll biosynthetic pathways were identified in all samples.By contrast,proteorhodopsins were only found in active beehive smoker diffusers.Taxonomic groups possessing potential phototrophy dependent on semiconductors present in hydrothermal vents were also found in these samples.This systematic comparative metagenomic study reveals the widespread distribution of phototrophic bacteria in hydrothermal vent fields.Our results support the hypothesis that the ocean is a seed bank of diverse microorganisms.Geothermal vent light may provide energy and confer a competitive advantage on phototrophs to proliferate in hydrothermal vent ecosystems.
