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

Result code in 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>
Result on the web
<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>

Result language
angličtina
Original language name
Modeling dynamic oxygen permeability as a mechanism to mitigate oxygen-induced stresses on photosynthesis and N2 fixation in marine Trichodesmium
Original language description
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.
Czech name
—
Czech description
—

Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
10606 - Microbiology

Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Similar results(10)