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Microbial community functioning during plant litter decomposition.

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Soil microbes adapt to diverse litter types by optimizing functions, despite competition from natural antibiotics. This specialization leads to distinct microbial communities but similar soil metabolomes, revealing dissolved organic matter

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Area of Science:

  • Soil microbiology
  • Biogeochemistry
  • Metabolomics

Background:

  • Soil microbial communities decompose dissolved organic matter (DOM) from litter.
  • Adaptation of decomposers to litter types is known, but functional interactions (competition vs. synergy) are unclear.

Purpose of the Study:

  • Investigate functional responses of soil decomposer communities to different litter types.
  • Determine if decomposers compete or cooperate when faced with varied litter sources.
  • Explore the role of DOM and its properties in shaping microbial communities.

Main Methods:

  • Lab-scale decomposition experiment using beech, oak, pine, and grass litter from two distinct sites.
  • Multi-omics approach: direct infusion HR-MS DOM analysis, 16S rRNA gene amplicon sequencing, and metaproteomics.
  • Correlative network analysis to link community function and DOM composition.

Main Results:

  • Redundant distribution of microbial functions, with rapid optimization to litter-specific properties.
  • Identification of natural antibiotics in DOM, suggesting antagonistic interactions drive community changes.
  • Evidence of community divergence (specialization) but metabolome convergence (similar DOM profiles) across litter types.

Conclusions:

  • Dissolved organic matter fuels soil life and contains information about ecosystem functioning.
  • Microbial communities specialize in response to litter type and decomposition stage, influenced by DOM properties and antagonistic interactions.
  • The interplay between community structure and DOM composition provides insights into soil ecosystem dynamics.