Diffusional Interactions among Marine Phytoplankton and Bacterioplankton: Modelling H2O2 as a Case Study

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388971%3A_____%2F22%3A00565459" target="_blank" >RIV/61388971:_____/22:00565459 - isvavai.cz</a>

Result on the web

<a href="https://www.mdpi.com/2076-2607/10/4/821" target="_blank" >https://www.mdpi.com/2076-2607/10/4/821</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3390/microorganisms10040821" target="_blank" >10.3390/microorganisms10040821</a>

Result language

angličtina

Original language name

Diffusional Interactions among Marine Phytoplankton and Bacterioplankton: Modelling H2O2 as a Case Study

Original language description

Marine phytoplankton vary widely in size across taxa, and in cell suspension densities across habitats and growth states. Cell suspension density and total biovolume determine the bulk influence of a phytoplankton community upon its environment. Cell suspension density also determines the intercellular spacings separating phytoplankton cells from each other, or from cooccurring bacterioplankton. Intercellular spacing then determines the mean diffusion paths for exchanges of solutes among co-occurring cells. Marine phytoplankton and bacterioplankton both produce and scavenge reactive oxygen species (ROS), to maintain intracellular ROS homeostasis to support their cellular processes, while limiting damaging reactions. Among ROS, hydrogen peroxide (H2O2) has relatively low reactivity, long intracellular and extracellular lifetimes, and readily crosses cell membranes. Our objective was to quantify how cells can influence other cells via diffusional interactions, using H2O2 as a case study. To visualize and constrain potentials for cell-to-cell exchanges of H2O2, we simulated the decrease of [H2O2] outwards from representative phytoplankton taxa maintaining internal [H2O2] above representative seawater [H2O2]. [H2O2] gradients outwards from static cell surfaces were dominated by volumetric dilution, with only a negligible influence from decay. The simulated [H2O2] fell to background [H2O2] within similar to 3.1 mu m from a Prochlorococcus cell surface, but extended outwards 90 mu m from a diatom cell surface. More rapid decays of other, less stable ROS, would lower these threshold distances. Bacterioplankton lowered simulated local [H2O2] below background only out to 1. 2 mu m from the surface of a static cell, even though bacterioplankton collectively act to influence seawater ROS. These small diffusional spheres around cells mean that direct cell-to-cell exchange of H2O2 is unlikely in oligotrophic habits with widely spaced, small cells, moderate in eutrophic habits with shorter cell-to-cell spacing, but extensive within phytoplankton colonies.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10606 - Microbiology

Project

<a href="/en/project/EF16_027%2F0007990" target="_blank" >EF16_027/0007990: International mobility of researchers of the Institute of Microbiology of the CAS, v. v. i.</a><br>

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2022

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Microorganisms

ISSN

2076-2607

e-ISSN

2076-2607

Volume of the periodical

10

Issue of the periodical within the volume

4

Country of publishing house

CH - SWITZERLAND

Number of pages

19

Pages from-to

821

UT code for WoS article

000786113900001

EID of the result in the Scopus database

2-s2.0-85128899398