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Area of Science:

  • Environmental microbiology
  • Virology
  • Biogeochemical cycles

Background:

  • Plastispheres are emerging microbial habitats on plastic debris.
  • Viruses are crucial regulators of microbial communities and metabolism.
  • The role of viruses within plastispheres remains largely unexplored.

Purpose of the Study:

  • To investigate the composition and function of viral communities in plastispheres.
  • To understand the impact of these viral communities on host metabolism, particularly methane cycling.
  • To assess the contribution of viruses to the biogeochemical impact of plastispheres.

Main Methods:

  • Microcosm experiments to study plastisphere viral communities.
  • Analysis of global plastisphere metagenomic data.
  • Phage transplantation experiments to determine viral functional roles.

Main Results:

  • Plastispheres host distinct viral communities with a high proportion (86.9%) of novel viral operational taxonomic units.
  • Plastisphere viruses possess auxiliary metabolic genes that modulate host methane metabolism.
  • Water plastispheres, acting as copiotrophic environments, show enhanced methanogenesis due to lysogenic viruses, suggesting potential methane emission hotspots.

Conclusions:

  • Viruses play a significant role in shaping the functional capacity of plastisphere microbial communities.
  • Auxiliary metabolic genes in viruses are key drivers of methane cycling within plastispheres.
  • Understanding viral contributions is essential for assessing the impact of plastispheres on global biogeochemical cycles, particularly methane emissions.