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Article Dans Une Revue Proceedings of the National Academy of Sciences of the United States of America Année : 2020

Algal photosynthesis converts nitric oxide into nitrous oxide

Résumé

Nitrous oxide (N 2 O), a potent greenhouse gas in the atmosphere, is produced mostly from aquatic ecosystems, to which algae substantially contribute. However, mechanisms of N 2 O production by pho-tosynthetic organisms are poorly described. Here we show that the green microalga Chlamydomonas reinhardtii reduces NO into N 2 O using the photosynthetic electron transport. Through the study of C. reinhardtii mutants deficient in flavodiiron proteins (FLVs) or in a cytochrome p450 (CYP55), we show that FLVs contribute to NO reduction in the light, while CYP55 operates in the dark. Both pathways are active when NO is produced in vivo during the reduction of nitrites and participate in NO homeostasis. Furthermore, NO reduction by both pathways is restricted to chlorophytes, organisms particularly abundant in ocean N 2 O-producing hot spots. Our results provide a mechanistic understanding of N 2 O production in eukaryotic phototrophs and represent an important step toward a comprehensive assessment of greenhouse gas emission by aquatic ecosystems.
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Dates et versions

hal-02441886 , version 1 (16-01-2020)

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Adrien Burlacot, Pierre Richaud, Arthur Gosset, Yonghua Li-Beisson, G. Peltier. Algal photosynthesis converts nitric oxide into nitrous oxide. Proceedings of the National Academy of Sciences of the United States of America, 2020, pp.201915276. ⟨10.1073/pnas.1915276117⟩. ⟨hal-02441886⟩
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