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Red Sea Coral Euphyllia paradivisa: Comparison
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Please note this is a comparison between Version 2 by Rita Xu and Version 3 by Rita Xu.

The recognition of the microbiota complexity and their role in the evolution of their host is leading to the popularization of the holobiont concept. However, the coral holobiont (host and its microbiota) is still enigmatic and unclear. Here, we explore the complex relations between different holobiont members of a mesophotic coral Euphyllia paradivisa. We subjected two lines of the coral—with photosymbionts, and without photosymbionts (apo‐symbiotic)—to increasing temperatures and to antibiotics. The different symbiotic states were characterized using transcriptomics, microbiology and physiology techniques. The bacterial community’s composition is dominated by bacteroidetes, alphaproteobacteria, and gammaproteobacteria, but is dependent upon the symbiont state, colony, temperature treatment, and antibiotic exposure. Overall, the most important parameter determining the response was whether the coral was a symbiont/apo‐symbiotic, while the colony and bacterial composition were secondary factors. Enrichment Gene Ontology analysis of coral host’s differentially expressed genes demonstrated the cellular differences between symbiotic and apo‐symbiotic samples. Our results demonstrate the significance of each component of the holobiont consortium and imply a coherent link between them, which dramatically impacts the molecular and cellular processes of the coral host, which possibly affect its fitness, particularly under environmental stress.

The recognition of the microbiota complexity and their role in the evolution of their host

is leading to the popularization of the holobiont concept. However, the coral holobiont (host and its

microbiota) is still enigmatic and unclear. Here, we explore the complex relations between different

holobiont members of a mesophotic coral Euphyllia paradivisa. We subjected two lines of the coral—

with photosymbionts, and without photosymbionts (apo‐symbiotic)—to increasing temperatures

and to antibiotics. The different symbiotic states were characterized using transcriptomics,

microbiology and physiology techniques. The bacterial community’s composition is dominated by

bacteroidetes, alphaproteobacteria, and gammaproteobacteria, but is dependent upon the symbiont

state, colony, temperature treatment, and antibiotic exposure. Overall, the most important

parameter determining the response was whether the coral was a symbiont/apo‐symbiotic, while

the colony and bacterial composition were secondary factors. Enrichment Gene Ontology analysis

of coral host’s differentially expressed genes demonstrated the cellular differences between

symbiotic and apo‐symbiotic samples. Our results demonstrate the significance of each component

of the holobiont consortium and imply a coherent link between them, which dramatically impacts

the molecular and cellular processes of the coral host, which possibly affect its fitness, particularly

under environmental stress.

  • holobiont
  • heat stress
  • algal symbiont
  • coral
  • Euphyllia paradivisa
  • apo‐symbiont
  • microbial communities
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References

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