Diatom phytochromes integrate the underwater light spectrum to sense depth.

Autor: Duchêne C; CNRS, Sorbonne Université, Institut de Biologie Physico-Chimique, Laboratoire de Biologie du Chloroplaste et Perception de la Lumière chez les Microalgues, UMR7141, Paris, France.; Department of Algal Development and Evolution, Max Planck Institute for Biology, Tübingen, Germany., Bouly JP; CNRS, Sorbonne Université, Institut de Biologie Physico-Chimique, Laboratoire de Biologie du Chloroplaste et Perception de la Lumière chez les Microalgues, UMR7141, Paris, France. jean-pierre.bouly@sorbonne-universite.fr.; UMR 7245, CNRS/MNHN, Molécules de Communication et Adaptation des Micro-Organismes (MCAM), Paris, France. jean-pierre.bouly@sorbonne-universite.fr., Pierella Karlusich JJ; Institut de Biologie de l'ENS (IBENS), Département de Biologie, École Normale Supérieure, CNRS, INSERM, Université PSL, Paris, France.; Research Federation for the Study of Global Ocean Systems Ecology and Evolution, FR2022/Tara GOSEE, Paris, France.; Department of Biology, Massachusetts Institute of Technology, Cambridge, MA, USA., Vernay E; CNRS, Sorbonne Université, Institut de Biologie Physico-Chimique, Laboratoire de Biologie du Chloroplaste et Perception de la Lumière chez les Microalgues, UMR7141, Paris, France., Sellés J; CNRS, Sorbonne Université, Institut de Biologie Physico-Chimique, Laboratoire de Biologie du Chloroplaste et Perception de la Lumière chez les Microalgues, UMR7141, Paris, France., Bailleul B; CNRS, Sorbonne Université, Institut de Biologie Physico-Chimique, Laboratoire de Biologie du Chloroplaste et Perception de la Lumière chez les Microalgues, UMR7141, Paris, France., Bowler C; Institut de Biologie de l'ENS (IBENS), Département de Biologie, École Normale Supérieure, CNRS, INSERM, Université PSL, Paris, France.; Research Federation for the Study of Global Ocean Systems Ecology and Evolution, FR2022/Tara GOSEE, Paris, France., Ribera d'Alcalà M; Stazione Zoologica Anton Dohrn, Naples, Italy., Falciatore A; CNRS, Sorbonne Université, Institut de Biologie Physico-Chimique, Laboratoire de Biologie du Chloroplaste et Perception de la Lumière chez les Microalgues, UMR7141, Paris, France. angela.falciatore@ibpc.fr., Jaubert M; CNRS, Sorbonne Université, Institut de Biologie Physico-Chimique, Laboratoire de Biologie du Chloroplaste et Perception de la Lumière chez les Microalgues, UMR7141, Paris, France. jaubert@ibpc.fr.
Jazyk: angličtina
Zdroj: Nature [Nature] 2024 Dec 18. Date of Electronic Publication: 2024 Dec 18.
DOI: 10.1038/s41586-024-08301-3
Abstrakt: Aquatic life is strongly structured by the distribution of light, which, besides attenuation in intensity, exhibits a continuous change in the spectrum with depth 1 . The extent to which these light changes are perceived by phytoplankton through photoreceptors is still inadequately known. We addressed this issue by integrating functional studies of diatom phytochrome (DPH) photoreceptors in model species 2 with environmental surveys of their distribution and activity. Here, by developing an in vivo dose-response assay to light spectral variations mediated by DPH, we show that DPH can trigger photoreversible responses across the entire light spectrum, resulting in a change in DPH photoequilibrium with depth. By generating dph mutants in the diatom Thalassiosira pseudonana, we also demonstrate that under simulated low-blue-light conditions of ocean depth, DPH regulates photosynthesis acclimation, thus linking optical depth detection with a functional response. The latitudinal distribution of DPH-containing diatoms from permanently stratified regions to seasonally mixed regions suggests an adaptive value of DPH functions in coping with vertical displacements in the water column. By establishing DPH as a detector of optical depth, this study provides a new view of how information embedded in the underwater light field can be exploited by diatoms to modulate their physiology throughout the photic zone.
Competing Interests: Competing interests: The authors declare no competing interests.
(© 2024. The Author(s), under exclusive licence to Springer Nature Limited.)
Databáze: MEDLINE
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