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Monitoring Spatial Segregation in Surface Colonizing Microbial Populations
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Explaining bacterial dispersion on leaf surfaces with an individual-based model (PHYLLOSIM).

Annemieke van der Wal1, Robin Tecon, Jan-Ulrich Kreft

  • 1Department of Microbial Ecology, Netherlands Institute of Ecology (NIOO-KNAW), Wageningen, The Netherlands.

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|October 15, 2013
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Summary

Bacterial cell detachment and reattachment drive cluster formation on plant leaves, explaining observed size variations. This mechanism is crucial for bacterial colonization in the phyllosphere environment.

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Area of Science:

  • Microbiology
  • Plant Science
  • Computational Biology

Background:

  • Bacterial colonization of plant leaf surfaces (phyllosphere) leads to cluster formation.
  • Observed variations in bacterial cluster size present a challenge for ecological modeling.

Purpose of the Study:

  • To develop and validate an individual-based model (PHYLLOSIM) explaining bacterial cluster size variation in the phyllosphere.
  • To investigate the impact of different 'waterscapes' (water film continuity and drop volume) on bacterial growth and dispersion.

Main Methods:

  • Development of the PHYLLOSIM model incorporating nutrient diffusion and bacterial growth.
  • Simulation of bacterial colonization under continuous water films and patchy water drops.
  • Comparison of model predictions with experimental data on bacterial dispersion patterns.
  • Experimental validation of bacterial cell detachment and attachment dynamics.

Main Results:

  • Initial models (null and patchy) failed to reproduce observed bacterial dispersion patterns, showing poor fit (<5%).
  • Incorporating a bacterial cell detachment and reattachment mechanism significantly improved model fit (70-80%) across all waterscapes.
  • Experimental observations confirmed the occurrence and importance of bacterial cell detachment and attachment events.

Conclusions:

  • Bacterial cell detachment and subsequent reattachment are key mechanisms driving bacterial cluster formation and dispersion in the phyllosphere.
  • The PHYLLOSIM model, including detachment, provides a more accurate representation of bacterial colonization dynamics on plant surfaces.
  • Understanding these mechanisms is vital for predicting microbial community structure and function in plant-associated environments.