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Systems view of Bacillus subtilis pellicle development.

Mojca Krajnc1, Polonca Stefanic1, Rok Kostanjšek2

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Bacillus subtilis pellicle formation involves dynamic changes in cell behavior and mechanical properties at the water-air interface. This study reveals key events driving pellicle development, cell redistribution, and eventual spore release.

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Area of Science:

  • Microbiology
  • Biophysics

Background:

  • Bacterial communities form structured communities at interfaces.
  • Pellicle formation by Bacillus subtilis is a complex surface phenomenon.

Purpose of the Study:

  • To link Bacillus subtilis pellicle development with cell behavior and viability.
  • To correlate pellicle mechanical properties with morphological changes.

Main Methods:

  • Real-time interfacial rheology.
  • Time-lapse confocal laser scanning microscopy.
  • Monitoring of cell aggregation, filamentation, and spore formation.

Main Results:

  • Six key events in pellicle formation correlate with changes in viscoelasticity and morphology.
  • Bacterial growth drives cell redistribution and limits viable habitat to the interface.
  • Pellicle collapse coincides with spore release, marking the end of the pellicle life cycle.

Conclusions:

  • Pellicle development is a multifaceted response to environmental changes induced by bacterial growth.
  • Mechanical stress supports pellicle structure until nutrient deprivation.
  • The pellicle life cycle concludes with dormancy and spore release.