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Thalassiosira pseudonana growth phase determines gene expression and algicidal behavior of a new Alteromonas macleodii strain
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Thalassiosira pseudonana growth phase determines gene expression and algicidal behavior of a new Alteromonas macleodii strain
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Thalassiosira pseudonana growth phase determines gene expression and algicidal behavior of a new Alteromonas macleodii strain
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Journal Article
Thalassiosira pseudonana growth phase determines gene expression and algicidal behavior of a new Alteromonas macleodii strain
2026
Overview
Diatoms are responsible for almost a quarter of global primary production, and their ecological roles are shaped by interactions with heterotrophic bacteria. These relationships can range from mutualistic to algicidal, with consequences for nutrient cycling and carbon export. Here, we show that the growth phase of the model diatom Thalassiosira pseudonana shapes its interaction with a newly isolated open-ocean strain of Alteromonas macleodii . Using transcriptomics and co-culture experiments, we demonstrate that bacterial gene expression dynamically shifts with host physiology, transitioning from motility and algicidal activity to aggregation and nutrient acquisition. Our findings reveal a two-stage interaction dynamic and highlight diatom growth phase as a critical, yet often overlooked, factor in determining the outcome of bacteria–algae interactions. By linking host physiology to bacterial behavioral shifts, this study provides new insights into how microscale dynamics can scale up to influence ocean productivity and biogeochemical cycling.
Publisher
American Society for Microbiology,American Society for Microbiology (ASM)
Subject
/ Algal Symbioses and Interactions
/ Algal-Bacterial Interactions
/ Alteromonas - growth & development
/ Bacterial-Eukaryotic Interactions
/ diatoms
/ Diatoms - growth & development
/ Ecological Impacts of Bacterial-Eukaryotic Interactions
/ Gene Expression Regulation, Bacterial
/ Marine Microbial Interactions
/ Marine Phytoplankton Culture
/ Microbial Ecology and Evolution
/ Microbial Physiology and Genetics
