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Pseudomonas ability to utilize different carbon substrates and adaptation influenced by protozoan grazing
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences. Umeå University, Faculty of Science and Technology, Umeå Marine Sciences Centre (UMF). (EcoChange; UMFpub)
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences. Umeå University, Faculty of Science and Technology, Umeå Marine Sciences Centre (UMF).ORCID iD: 0000-0002-1298-3839
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences. Umeå University, Faculty of Science and Technology, Umeå Marine Sciences Centre (UMF).
Umeå University, Faculty of Science and Technology, Umeå Marine Sciences Centre (UMF). Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.ORCID iD: 0000-0001-7819-9038
2023 (English)In: Environmental Research, ISSN 0013-9351, E-ISSN 1096-0953, Vol. 232, article id 116419Article in journal (Refereed) Published
Abstract [en]

Bacteria are major utilizers of dissolved organic matter in aquatic systems. In coastal areas bacteria are supplied with a mixture of food sources, spanning from refractory terrestrial dissolved organic matter to labile marine autochthonous organic matter. Climate scenarios indicate that in northern coastal areas, the inflow of terrestrial organic matter will increase, and autochthonous production will decrease, thus bacteria will experience a change in the food source composition. How bacteria will cope with such changes is not known. Here, we tested the ability of an isolated bacterium from the northern Baltic Sea coast, Pseudomonas sp., to adapt to varying substrates.

We performed a 7-months chemostat experiment, where three different substrates were provided: glucose, representing labile autochthonous organic carbon, sodium benzoate representing refractory organic matter, and acetate – a labile but low energy food source. Growth rate has been pointed out as a key factor for fast adaptation, and since protozoan grazers speed-up the growth rate we added a ciliate to half of the incubations. The results show that the isolated Pseudomonas is adapted to utilize both labile and ring-structured refractive substrates. The growth rate was the highest on the benzoate substrate, and the production increased over time indicating that adaptation did occur. Further, our findings indicate that predation can cause Pseudomonas to change their phenotype to resist and promote survival in various carbon substrates. Genome sequencing reveals different mutations in the genome of adapted populations compared to the native populations, suggesting the adaptation of Pseudomonas sp. to changing environment.

Place, publisher, year, edition, pages
Elsevier, 2023. Vol. 232, article id 116419
Keywords [en]
Grazing resistance, Carbon substrates, Protozoan grazing, Adaptation, Baltic Sea
National Category
Ecology Microbiology
Identifiers
URN: urn:nbn:se:umu:diva-210067DOI: 10.1016/j.envres.2023.116419ISI: 001025058800001PubMedID: 37321339Scopus ID: 2-s2.0-85161992549OAI: oai:DiVA.org:umu-210067DiVA, id: diva2:1769871
Funder
Carl Tryggers foundation Swedish Research Council Formas, FR-2019/0007Ecosystem dynamics in the Baltic Sea in a changing climate perspective - ECOCHANGEAvailable from: 2023-06-19 Created: 2023-06-19 Last updated: 2023-09-05Bibliographically approved

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Ramasamy, Kesava PriyanBrugel, SoniaEriksson, Karolina Ida AnnaAndersson, Agneta

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