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Microbial interactions within a cheese microbial community.

Jérôme Mounier1, Christophe Monnet, Tatiana Vallaeys

  • 1UMR782 Génie et Microbiologie des Procédés Alimentaires, INRA, AgroParisTech, 78850 Thiverval Grignon, France.

Applied and Environmental Microbiology
|November 6, 2007
PubMed
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Interactions between yeasts and bacteria in smear cheese ripening are complex. Yeasts significantly influence bacterial growth, with some bacteria depending on specific yeast partners for development.

Area of Science:

  • Food Microbiology
  • Microbial Ecology
  • Cheese Ripening

Background:

  • Smear cheese ripening involves intricate microbial interactions that are not fully understood.
  • Understanding yeast-yeast and yeast-bacterium dynamics is crucial for controlling cheese ecosystem development.

Purpose of the Study:

  • To investigate yeast-yeast and yeast-bacterium interactions within a defined microbial community during model smear cheese ripening.
  • To evaluate the impact of yeast presence on bacterial community structure and ecosystem functioning.

Main Methods:

  • Cultivation of a microbial community (three yeasts, six bacteria) on a model cheese.
  • Precise description of community growth dynamics during ripening.
  • Application of the Lotka-Volterra model to assess species interactions and yeast omission studies.

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Main Results:

  • Negative yeast-yeast interactions were observed, with Yarrowia lipolytica inhibiting Geotrichum candidum and both inhibiting Debaryomyces hansenii.
  • Yeasts acted as key species for bacterial development, but their influence varied; Arthrobacter arilaitensis and Hafnia alvei showed less dependence on specific yeasts.
  • Specific yeast dependencies were noted for Leucobacter sp. and Brevibacterium aurantiacum, relying on G. candidum, while some bacteria exhibited reduced colonization.

Conclusions:

  • Microbial interactions, particularly yeast-bacterium relationships, are significant drivers of smear cheese surface ecosystem establishment.
  • The specific roles of yeasts in supporting bacterial growth are diverse, impacting the overall microbial community structure.
  • Further research is needed to elucidate the precise mechanisms underlying these complex microbial interactions.