Growth-stage-related shifts in diatom endometabolome composition set the stage for bacterial heterotrophy.

Autor: Olofsson M; Department of Marine Sciences, University of Georgia, Athens, GA, 30602, USA.; Department of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences, 750 57, Uppsala, Sweden., Ferrer-González FX; Department of Marine Sciences, University of Georgia, Athens, GA, 30602, USA., Uchimiya M; Department of Marine Sciences, University of Georgia, Athens, GA, 30602, USA.; Department of Biochemistry and Complex Carbohydrate Research Center, University of Georgia, Athens, GA, 30602, USA., Schreier JE; Department of Marine Sciences, University of Georgia, Athens, GA, 30602, USA., Holderman NR; Department of Biochemistry and Complex Carbohydrate Research Center, University of Georgia, Athens, GA, 30602, USA., Smith CB; Department of Marine Sciences, University of Georgia, Athens, GA, 30602, USA., Edison AS; Department of Biochemistry and Complex Carbohydrate Research Center, University of Georgia, Athens, GA, 30602, USA., Moran MA; Department of Marine Sciences, University of Georgia, Athens, GA, 30602, USA. mmoran@uga.edu.
Jazyk: angličtina
Zdroj: ISME communications [ISME Commun] 2022 Mar 30; Vol. 2 (1), pp. 28. Date of Electronic Publication: 2022 Mar 30.
DOI: 10.1038/s43705-022-00116-5
Abstrakt: Phytoplankton-derived metabolites fuel a large fraction of heterotrophic bacterial production in the global ocean, yet methodological challenges have limited our understanding of the organic molecules transferred between these microbial groups. In an experimental bloom study consisting of three heterotrophic marine bacteria growing together with the diatom Thalassiosira pseudonana, we concurrently measured diatom endometabolites (i.e., potential exometabolite supply) by nuclear magnetic resonance (NMR) spectroscopy and bacterial gene expression (i.e., potential exometabolite uptake) by metatranscriptomic sequencing. Twenty-two diatom endometabolites were annotated, with nine increasing in internal concentration in the late stage of the bloom, eight decreasing, and five showing no variation through the bloom progression. Some metabolite changes could be linked to shifts in diatom gene expression, as well as to shifts in bacterial community composition and their expression of substrate uptake and catabolism genes. Yet an overall low match indicated that endometabolome concentration was not a good predictor of exometabolite availability, and that complex physiological and ecological interactions underlie metabolite exchange. Six diatom endometabolites accumulated to higher concentrations in the bacterial co-cultures compared to axenic cultures, suggesting a bacterial influence on rates of synthesis or release of glutamate, arginine, leucine, 2,3-dihydroxypropane-1-sulfonate, glucose, and glycerol-3-phosphate. Better understanding of phytoplankton metabolite production, release, and transfer to assembled bacterial communities is key to untangling this nearly invisible yet pivotal step in ocean carbon cycling.
(© 2022. The Author(s).)
Databáze: MEDLINE
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