Modeling dynamic oxygen permeability as a mechanism to mitigate oxygen-induced stresses on photosynthesis and N2 fixation in marine Trichodesmium

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388971%3A_____%2F25%3A00642804" target="_blank" >RIV/61388971:_____/25:00642804 - isvavai.cz</a>

Výsledek na webu

<a href="https://journals.asm.org/doi/10.1128/spectrum.00453-25" target="_blank" >https://journals.asm.org/doi/10.1128/spectrum.00453-25</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1128/spectrum.00453-25" target="_blank" >10.1128/spectrum.00453-25</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Modeling dynamic oxygen permeability as a mechanism to mitigate oxygen-induced stresses on photosynthesis and N2 fixation in marine Trichodesmium

Popis výsledku v původním jazyce

Trichodesmium, the predominant marine diazotrophic cyanobacterium, concurrently performs nitrogen (N-2) fixation and photosynthesis, the latter of which produces oxygen (O-2) that inhibits N-2 fixation. Hopanoid lipids in Trichodesmium may play a role in dynamically regulating membrane permeability to O-2, potentially alleviating O-2 stress on N-2 fixation. However, the physiological impacts of this dynamic permeability are not well understood. We developed a model showing that dynamically modulating membrane O-2 permeability can enhance N-2 fixation and growth of Trichodesmium by over 50%. High O-2 permeability (1.5 x 10(-4) of O-2 diffusivity in seawater) during strong photosynthesis accelerates O-2 exhaust, reducing energy-consuming photorespiration by similar to 40%, while low O-2 permeability (1.0 x 10(-5) diffusivity) during active N-2 fixation minimizes O-2 stress on N-2 fixation. Together, these mechanisms increase the carbon and iron use efficiencies by similar to 70%. Our study provides a mechanistic and quantitative framework for how dynamic O-2 permeability benefits Trichodesmium, offering insights potentially applicable to other diazotrophs.

Název v anglickém jazyce

Modeling dynamic oxygen permeability as a mechanism to mitigate oxygen-induced stresses on photosynthesis and N2 fixation in marine Trichodesmium

Popis výsledku anglicky

Trichodesmium, the predominant marine diazotrophic cyanobacterium, concurrently performs nitrogen (N-2) fixation and photosynthesis, the latter of which produces oxygen (O-2) that inhibits N-2 fixation. Hopanoid lipids in Trichodesmium may play a role in dynamically regulating membrane permeability to O-2, potentially alleviating O-2 stress on N-2 fixation. However, the physiological impacts of this dynamic permeability are not well understood. We developed a model showing that dynamically modulating membrane O-2 permeability can enhance N-2 fixation and growth of Trichodesmium by over 50%. High O-2 permeability (1.5 x 10(-4) of O-2 diffusivity in seawater) during strong photosynthesis accelerates O-2 exhaust, reducing energy-consuming photorespiration by similar to 40%, while low O-2 permeability (1.0 x 10(-5) diffusivity) during active N-2 fixation minimizes O-2 stress on N-2 fixation. Together, these mechanisms increase the carbon and iron use efficiencies by similar to 70%. Our study provides a mechanistic and quantitative framework for how dynamic O-2 permeability benefits Trichodesmium, offering insights potentially applicable to other diazotrophs.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10606 - Microbiology

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2025

Kód důvěrnosti údajů

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

Název periodika

Microbiology Spectrum

ISSN

2165-0497

e-ISSN

2165-0497

Svazek periodika

13

Číslo periodika v rámci svazku

10

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

18

Strana od-do

e00453-25

Kód UT WoS článku

001550591300001

EID výsledku v databázi Scopus

2-s2.0-105017979150