Impact of phages on the dynamics and metabolism of a model microbial community inspired from a fermented beverage - Normandie Université
Communication Dans Un Congrès Année : 2022

Impact of phages on the dynamics and metabolism of a model microbial community inspired from a fermented beverage

Résumé

Model microbial communities are often studied to better understand interactions and fluxes during fermentation processes. However, models taking into consideration the potential impact of bacteriophages (phages), recognized as drivers of microbial communities, are scarce. This study aimed at investigating the behavior of a model microbial community inspired from cider, an alcoholic fermented beverage, including phages, and being subjected to dysbiosis. The model microbial community was composed of three lactic acid bacteria strains belonging to the species Liquorilactobacillus mali, Leuconosctoc mesenteroides and Oenococcus oeni, and of a Saccharomyces uvarum yeast strain. Two phages were selected, targeting L. mali and Ln. mesenteroides strains. Experiments were performed in MRS broth at 25°C and 15°C during 168 and 220 hours, respectively. Dysbiosis was created by a heat shock at 50°C for 10 min applied when the community reached 105 CFU/mL before adding phages. Microbial community was monitored by enumerating phages and bacteria, and measuring pH. The consumption of sugars and the production of organic acids, ethanol and volatile compounds were also assessed by HPLC and GC-MS. At 25°C, the community with phages (P) was closer to the control community (C) than to the community without phages (D). Bacterial levels were all around 108 UFC/mL in conditions C and P, which were characterized by high concentrations in 2-phenyl-ethanol, 3-methyl-butanol and octanoic acid. In condition D, L. mali and Ln. mesenteroides were dominant while S. uvarum and O. oeni did not exceed 105 UFC/mL. The concentration of ethyl-lactate was higher in condition D than in conditions C and P. After 220h at 15°C, condition P differed from conditions C and D, as Ln. mesenteroides was not detectable while the other strains all reached approximately the same levels (about 107-108 UFC/mL). The current study is the first report dealing with the impact of phages on a microbial model inspired from a fermented beverage. It showed the importance of phages on microbial fluctuations and metabolism, as phages seemed to contribute to restore microbial balance after dysbiosis, depending on temperature. Getting knowledge about phage impacts in microbial models is crucial to guarantee the production of safe and sustainable foods.
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Dates et versions

hal-04695783 , version 1 (12-09-2024)

Identifiants

  • HAL Id : hal-04695783 , version 1

Citer

Pierre Ledormand, Nathalie N. Desmasures, Margot Schlusselhuber, André Sesboüé, Jerome Ledauphin, et al.. Impact of phages on the dynamics and metabolism of a model microbial community inspired from a fermented beverage. 27th FoodMicro congress, Aug 2022, Athens, Greece. ⟨hal-04695783⟩
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