PINTO, J.; LAMI, R.; KRASOVEC, M.; GRIMAUD, R.; URIOS, L.; LUPETTE, Josselin; ESCANDE, M.-L.; SANCHEZ, F.; INTERTAGLIA, L.; GRIMSLEY, N.; PIGANEAU, G.; SANCHEZ-BROSSEAU, S.

doi:10.3390/microorganisms9081777

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Article de revue

Ce document a été publié dans

Microorganisms. 2021, vol. 9, n° 8

Résumé en anglais

Although interactions between microalgae and bacteria are observed in both natural environment and the laboratory, the modalities of coexistence of bacteria inside microalgae phycospheres in laboratory cultures are mostly unknown. Here, we focused on well-controlled cultures of the model green picoalga Ostreococcus tauri and the most abundant member of its phycosphere, Marinobacter algicola. The prevalence of M. algicola in O. tauri cultures raises questions about how this bacterium maintains itself under laboratory conditions in the microalga culture. The results showed that M. algicola did not promote O. tauri growth in the absence of vitamin B12 while M. algicola depended on O. tauri to grow in synthetic medium, most likely to obtain organic carbon sources provided by the microalgae. M. algicola grew on a range of lipids, including triacylglycerols that are known to be produced by O. tauri in culture during abiotic stress. Genomic screening revealed the absence of genes of two particular modes of quorum-sensing in Marinobacter genomes which refutes the idea that these bacterial communication systems operate in this genus. To date, the ‘opportunistic’ behaviour of M. algicola in the laboratory is limited to several phytoplanktonic species including Chlorophyta such as O. tauri. This would indicate a preferential occurrence of M. algicola in association with these specific microalgae under optimum laboratory conditions.< Réduire

Mots clés en anglais

Ostreococcus

Phycosphere

Phytoplanton

Cocultures

Marinobacter

Bacteria

URI

https://oskar-bordeaux.fr/handle/20.500.12278/136402

DOI

http://dx.doi.org/10.3390/microorganisms9081777

Unités de recherche

Laboratoire de Biogenèse Membranaire (LBM) - UMR 5200

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Features of the opportunistic behaviour of the marine bacterium marinobacter algicola in the microalga ostreococcus tauri phycosphere

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Résumé en anglais

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