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• W2738588459 endingPage "176" @default.
• W2738588459 startingPage "147" @default.
• W2738588459 abstract "Abstract Could oxygenic and/or anoxygenic photosynthesis exist on planet Proxima Centauri b? Proxima Centauri (spectral type – M5.5 V, 3050 K) is a red dwarf, whereas the Sun is type G2 V (5780 K). The light regimes on Earth and Proxima Centauri b are compared with estimates of the planet's suitability for Chlorophyll a (Chl a ) and Chl d- based oxygenic photosynthesis and for bacteriochlorophyll (BChl)-based anoxygenic photosynthesis. Proxima Centauri b has low irradiance in the oxygenic photosynthesis range (400–749 nm: 64–132 µmol quanta m −2 s −1 ). Much larger amounts of light would be available for BChl-based anoxygenic photosynthesis (350–1100 nm: 724–1538 µmol quanta m −2 s −1 ). We estimated primary production under these light regimes. We used the oxygenic algae Synechocystis PCC6803, Prochlorothrix hollandica , Acaryochloris marina , Chlorella vulgaris , Rhodomonas sp. and Phaeodactylum tricornutum and the anoxygenic photosynthetic bacteria Rhodopseudomonas palustris (BChl a ), Afifella marina (BChl a ), Thermochromatium tepidum (BChl a ), Chlorobaculum tepidum (BChl a + c ) and Blastochloris viridis (BChl b ) as representative photosynthetic organisms. Proxima Centauri b has only ≈3% of the PAR (400–700 nm) of Earth irradiance, but we found that potential gross photosynthesis ( P g ) on Proxima Centauri b could be surprisingly high (oxygenic photosynthesis: earth ≈0.8 gC m −2 h −1 ; Proxima Centauri b ≈0.14 gC m −2 h −1 ). The proportion of PAR irradiance useable by oxygenic photosynthetic organisms (the sum of Blue + Red irradiance) is similar for the Earth and Proxima Centauri b. The oxygenic photic zone would be only ≈10 m deep in water compared with ≈200 m on Earth. The P g of an anoxic Earth (gC m −2 h −1 ) is ≈0.34–0.59 (land) and could be as high as ≈0.29–0.44 on Proxima Centauri b. 1 m of water does not affect oxygenic or anoxygenic photosynthesis on Earth, but on Proxima Centauri b oxygenic P g is reduced by ≈50%. Effective elimination of near IR limits P g by photosynthetic bacteria (<10% of the surface value). The spectrum of Proxima Centauri b is unfavourable for anoxygenic aquatic photosynthesis. Nevertheless, a substantial aerobic or anaerobic ecology is possible on Proxima Centauri b. Protocols to recognize the biogenic signature of anoxygenic photosynthesis are needed." @default.
• W2738588459 created "2017-07-31" @default.
• W2738588459 creator A5025348323 @default.
• W2738588459 creator A5039838014 @default.
• W2738588459 creator A5047871874 @default.
• W2738588459 date "2017-07-18" @default.
• W2738588459 modified "2023-10-05" @default.
• W2738588459 title "Could photosynthesis function on Proxima Centauri b?" @default.
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