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Provedor de dados:  ArchiMer
País:  France
Título:  Bacteria enhance the production of extracellular polymeric substances by the green dinoflagellate Lepidodinium chlorophorum
Autores:  Roux, Pauline
Siano, Raffaele
Collin, Karine
Bilien, Gwenael
Sinquin, Corinne
Marchand, Laetitia
Zykwinska, Agata
Delbarre-ladrat, Christine
Schapira, Mathilde
Data:  2021-02
Ano:  2021
Resumo:  High biomasses of the marine dinoflagellate Lepidodinium chlorophorum cause green seawater discolorations along Southern Brittany (NE Atlantic, France). The viscosity associated to these phenomena has been related to problems in oyster cultivation. The harmful effect of L. chlorophorum might originate from the secretion of Extracellular Polymeric Substances (EPS). To understand whether the EPS are produced by L. chlorophorum or its associated bacteria, or if they are a product of their interaction, batch cultures were performed under non-axenic and pseudo-axenic conditions for three strains. Maximum dinoflagellate cell abundances were observed in pseudo-axenic cultures. The non-sinking fraction of polymers (Soluble Extracellular Polymers, SEP), mainly composed of proteins and the exopolysaccharide sulphated galactan, slightly increased in pseudo-axenic cultures. The amount of Transparent Exopolymer Particles (TEP) per cell increased under non-axenic conditions. Despite the high concentrations of Particulate Organic Carbon (POC) measured, viscosity did not vary. These results suggest that the L. chlorophorum-bacteria interaction could have a detrimental consequence on the dinoflagellate, translating in a negative effect on L. chlorophorum growth, as well as EPS overproduction by the dinoflagellate, at concentrations that should not affect seawater viscosity.
Tipo:  Text
Idioma:  Inglês

Editor:  Springer Science and Business Media LLC
Formato:  application/pdf
Fonte:  Scientific Reports (2045-2322) (Springer Science and Business Media LLC), 2021-02 , Vol. 11 , N. 1 , P. 4795 (15p.)
Direitos:  info:eu-repo/semantics/openAccess

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