Enrichment of Clostridia enhances Geobacter population and electron harvesting in a complex electroactive biofilm - Université des Antilles Accéder directement au contenu
Article Dans Une Revue Bioelectrochemistry Année : 2022

Enrichment of Clostridia enhances Geobacter population and electron harvesting in a complex electroactive biofilm

Résumé

Current research on microbial fuel cell or microbial electrolysis cell dealt with finding new electroactive bacteria and understanding the mechanisms of electronic exchange. Complex consortia allowed to obtain better performances than pure cultures in part thanks to inter-species cooperation. However, the role of each bacterium in a complex biofilm in the electron harvest on an electrode remains unclear. Thus, we combined electrochemical monitoring of electron exchange and high throughput sequencing analysis in order to describe the bacterial composition and the electroactive performance of mangrove mud biofilms. In this study, secondary electroactive biofilms were formed on carbon electrodes from Desulfuromonas-dominated inoculum of pre-formed bioanodes. The performances and the Desulfuromonas-dominated profile were the same as those of primary bioanodes when the planktonic community was conserved. However, a Clostridium enrichment allowed to restore the performance in maximal current densities promoting an increase of Geobacter population, becoming the most dominant group among the Deltaproteobacteria, replacing Desulfuromonas. These results highlight a positive collaboration between Clostridium and Geobacter spp. helping a bacterial population to achieve with the depletion of their environment. Our study provides new insight into relationships between dominant electroactive bacteria and other bacteria species living in an organic matter-rich environment as mangrove sediments.
Fichier principal
Vignette du fichier
S1567539421002176.pdf (1.85 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-03544404 , version 1 (16-10-2023)

Licence

Paternité - Pas d'utilisation commerciale

Identifiants

Citer

Caroline Rivalland, Fatima Radouani, Silvina Gonzalez-Rizzo, Florent Robert, Paule Salvin. Enrichment of Clostridia enhances Geobacter population and electron harvesting in a complex electroactive biofilm. Bioelectrochemistry, 2022, 143, pp.107954. ⟨10.1016/j.bioelechem.2021.107954⟩. ⟨hal-03544404⟩
92 Consultations
17 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More