ArticleFEMS microbes2026
Is a constitutive red-shift an advantage for oxygenic photosynthesis under M dwarf starlight? Insights from
Article in FEMS microbes, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
In the next decades, space telescope missions will search for life evidence on exoplanets, focusing on robust biosignatures associated with oxygenic photosynthesis, including atmospheric oxygen accumulation and the Vegetation Red-Edge in surface reflectance spectra. Many habitable rocky exoplanets orbit M dwarf stars, whose spectral energy distribution may condition the rise and evolution of oxygenic photosynthesis. M dwarf stars emit predominantly far-red (700-750 nm) and near-infrared (750-1000 nm) light, and relatively little visible (400-700 nm) radiation, which on Earth predominantly drives photochemistry in most oxygenic phototrophs. Previous experiments proved some oxygenic phototrophs can photosynthesize under simulated M dwarf light but less efficiently than under solar radiation simulated in the range 365-780 nm. Indeed, tested organisms present photosynthetic apparatus evolved to harvest Sun's visible light, however, M dwarfs' irradiation might select adaptations optimized for harvesting far-red/near-infrared light. We measured sensitivities of a far-red/near-infrared-utilizing cyanobacterium,
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