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Fire impacts bacterial composition in Protea repens (Proteaceae) infructescences.

Zander R Human1, Francois Roets2, Casparus J Crous2

  • 1Department of Biochemistry, Genetics and Microbiology, Forestry and Agricultural Biotechnology Institute, University of Pretoria, Pretoria 0002, South Africa.

FEMS Microbiology Letters
|October 9, 2021
PubMed
Summary

Fire disturbances alter bacterial communities in Protea repens landscapes. Fruiting structures may serve as crucial reservoirs for postfire decomposer bacteria, impacting microbial diversity.

Keywords:
Protea repensfirefynbosinfructescencesplant associatedrecolonize

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Area of Science:

  • Microbial ecology
  • Plant-microbe interactions
  • Ecosystem resilience

Background:

  • Plant-associated bacteria are vital for ecosystem functions like nutrient cycling and pathogen defense.
  • Fynbos landscapes, characterized by Protea repens, often lack deadwood habitats due to frequent fires and absence of large trees.
  • Fire is a significant disturbance factor in many ecosystems, influencing microbial community structure and function.

Purpose of the Study:

  • To investigate the impact of fire disturbance on bacterial communities in Protea repens infructescences and soil.
  • To identify potential microbial reservoirs for decomposition in post-fire fynbos environments.
  • To assess the role of P. repens structures in supporting bacterial communities.

Main Methods:

  • 16S ribosomal RNA (rRNA) amplicon sequencing was employed to analyze bacterial community composition.
  • Bacterial communities were compared between recently burnt and unburnt sites within a fynbos landscape.
  • Samples were collected from Protea repens infructescences and associated soil.

Main Results:

  • Bacterial community composition in both infructescences and soil differed significantly between burnt and unburnt sites.
  • Bacteria found in P. repens infructescences exhibited similarities to known taxa associated with decomposing wood and litter.
  • This suggests that aboveground plant structures can harbor decomposer bacteria.

Conclusions:

  • Protea repens infructescences may act as important reservoirs for post-fire decomposer bacteria in fynbos ecosystems.
  • Frequent fires, exacerbated by anthropogenic activities, pose a significant disturbance to these bacterial communities.
  • Altered fire regimes could negatively impact the diversity of essential soil and plant-associated microbes.