Air channels create a directional light signal to regulate hypocotyl phototropism.

Autor: Nawkar GM; Centre for Integrative Genomics, Faculty of Biology and Medicine, Génopode Building, University of Lausanne, 1015 Lausanne, Switzerland., Legris M; Centre for Integrative Genomics, Faculty of Biology and Medicine, Génopode Building, University of Lausanne, 1015 Lausanne, Switzerland., Goyal A; Centre for Integrative Genomics, Faculty of Biology and Medicine, Génopode Building, University of Lausanne, 1015 Lausanne, Switzerland., Schmid-Siegert E; SIB, Swiss Institute for Bioinformatics, University of Lausanne, 1015 Lausanne, Switzerland., Fleury J; EPFL Renewable Energies Cluster ENAC, 1015 Lausanne, Switzerland., Mucciolo A; Electron Microscopy Facility, EMF, Faculty of Biology and Medicine, Biophore Building, University of Lausanne, 1015 Lausanne, Switzerland., De Bellis D; Electron Microscopy Facility, EMF, Faculty of Biology and Medicine, Biophore Building, University of Lausanne, 1015 Lausanne, Switzerland.; Department of Plant Molecular Biology, Faculty of Biology and Medicine, Biophore Building University of Lausanne, 1015 Lausanne, Switzerland., Trevisan M; Centre for Integrative Genomics, Faculty of Biology and Medicine, Génopode Building, University of Lausanne, 1015 Lausanne, Switzerland., Schueler A; EPFL Renewable Energies Cluster ENAC, 1015 Lausanne, Switzerland., Fankhauser C; Centre for Integrative Genomics, Faculty of Biology and Medicine, Génopode Building, University of Lausanne, 1015 Lausanne, Switzerland.
Jazyk: angličtina
Zdroj: Science (New York, N.Y.) [Science] 2023 Nov 24; Vol. 382 (6673), pp. 935-940. Date of Electronic Publication: 2023 Nov 23.
DOI: 10.1126/science.adh9384
Abstrakt: In plants, light direction is perceived by the phototropin photoreceptors, which trigger directional growth responses known as phototropism. The formation of a phototropin activation gradient across a photosensitive organ initiates this response. However, the optical tissue properties that functionally contribute to phototropism remain unclear. In this work, we show that intercellular air channels limit light transmittance through various organs in several species. Air channels enhance light scattering in Arabidopsis hypocotyls, thereby steepening the light gradient. This is required for an efficient phototropic response in Arabidopsis and Brassica. We identified an embryonically expressed ABC transporter required for the presence of air channels in seedlings and a structure surrounding them. Our work provides insights into intercellular air space development or maintenance and identifies a mechanism of directional light sensing in plants.
Databáze: MEDLINE
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