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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\u2013750 nm) and near-infrared (750\u20131000 nm) light, and relatively little visible (400\u2013700 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\u2013780 nm. Indeed, tested organisms present photosynthetic apparatus evolved to harvest Sun\u2019s visible light, however, M dwarfs\u2019 irradiation might select adaptations optimized for harvesting far-red\/near-infrared light. We measured sensitivities of a far-red\/near-infrared-utilizing cyanobacterium, Acaryochloris marina sp. str. Moss Beach to simulated M dwarf spectrum and primeval anoxic, CO2-rich atmosphere. This strain constitutively presents a high content of chlorophyll d, with in vivo absorption peak at 710\u00a0nm. Its permanently red-shifted photosynthetic apparatus required no acclimation to the stellar spectrum, maintaining strong growth and oxygen production, higher than that registered under simulated solar light. Moreover, abundant chlorophyll d caused a shift in whole-cell reflectance: the red-edge was beyond 700\u00a0nm, resulting in a Chl d-near-infrared-edge. Overall, a potentially similar metabolism on exoplanets orbiting M dwarfs could successfully produce both a gaseous biosignature and a characteristic surface biosignature.<\/jats:p>","DOI":"10.1093\/femsmc\/xtag042","type":"journal-article","created":{"date-parts":[[2026,7,23]],"date-time":"2026-07-23T11:54:28Z","timestamp":1784807668000},"source":"Crossref","is-referenced-by-count":0,"title":["Is a constitutive red-shift an advantage for oxygenic photosynthesis under M dwarf starlight? Insights from\n                    <i>Acaryochloris marina<\/i>\n                    sp. str. Moss Beach"],"prefix":"10.1093","volume":"7","author":[{"ORCID":"https:\/\/orcid.org\/0009-0002-6302-3747","authenticated-orcid":false,"given":"Elisabetta","family":"Liistro","sequence":"first","affiliation":[{"name":"University of Padova Department of Biology, , Padova, 35131 ,","place":["Italy"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0008-4119-8005","authenticated-orcid":false,"given":"Beatrice","family":"Boccia","sequence":"additional","affiliation":[{"name":"University of Padova Department of Biology, , Padova, 35131 ,","place":["Italy"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1225-6727","authenticated-orcid":false,"given":"Mary Niki","family":"Parenteau","sequence":"additional","affiliation":[{"name":"NASA Ames Research Center, Moffett Field , CA 94035 ,","place":["United States"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5730-924X","authenticated-orcid":false,"given":"Nancy Y","family":"Kiang","sequence":"additional","affiliation":[{"name":"NASA Goddard Institute for Space Studies , New York, NY 10025 ,","place":["United States"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4866-5952","authenticated-orcid":false,"given":"Nicoletta","family":"La\u00a0Rocca","sequence":"additional","affiliation":[{"name":"University of Padova Department of Biology, , Padova, 35131 ,","place":["Italy"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"286","published-online":{"date-parts":[[2026,7,23]]},"reference":[{"key":"2026101211365575100_bib1","doi-asserted-by":"publisher","first-page":"59","DOI":"10.1016\/0022-5193(61)90026-1","article-title":"Methods for measuring and correcting the absorption spectrum of scattering suspensions","volume":"1","author":"Amesz","year":"1961","journal-title":"J Theor Biol"},{"key":"2026101211365575100_bib2","doi-asserted-by":"publisher","first-page":"437","DOI":"10.1038\/nature19106","article-title":"A terrestrial planet candidate in a temperate orbit around Proxima Centauri","volume":"536","author":"Anglada-Escud\u00e9","year":"2016","journal-title":"Nature"},{"key":"2026101211365575100_bib3","doi-asserted-by":"publisher","first-page":"2539","DOI":"10.1016\/j.cub.2025.04.038","article-title":"Evolution of far-red light photoacclimation in cyanobacteria","volume":"35","author":"Antonaru","year":"2025","journal-title":"Curr Biol"},{"key":"2026101211365575100_bib4","doi-asserted-by":"publisher","first-page":"873","DOI":"10.1089\/ast.2015.1422","article-title":"The Pale Orange Dot: the spectrum and habitability of Hazy Archean Earth","volume":"16","author":"Arney","year":"2016","journal-title":"Astrobiology"},{"key":"2026101211365575100_bib5","doi-asserted-by":"publisher","first-page":"16","DOI":"10.1186\/s40659-017-0120-0","article-title":"Photosynthesis at the far-red region of the spectrum in Acaryochloris marina","volume":"50","author":"Badshah","year":"2017","journal-title":"Biol Res"},{"key":"2026101211365575100_bib6","doi-asserted-by":"publisher","first-page":"1070359","DOI":"10.3389\/fpls.2023.1070359","article-title":"Oxygenic photosynthetic responses of cyanobacteria exposed under an M-dwarf starlight simulator: implications for exoplanet\u2019s habitability","volume":"14","author":"Battistuzzi","year":"2023","journal-title":"Front Plant Sci"},{"key":"2026101211365575100_bib7","doi-asserted-by":"publisher","first-page":"1641","DOI":"10.3390\/life13081641","article-title":"Growth and photosynthetic efficiency of microalgae and plants with different levels of complexity exposed to a simulated M-dwarf starlight","volume":"13","author":"Battistuzzi","year":"2023","journal-title":"Life"},{"key":"2026101211365575100_bib8","doi-asserted-by":"publisher","first-page":"1322052","DOI":"10.3389\/fpls.2023.1322052","article-title":"Transcriptomic and photosynthetic analyses of Synechocystis sp. 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