INCE, Yetkin Caka; KRAHMER, Johanna; FIORUCCI, Anne-Sophie; TREVISAN, Martine; GALVÃO, Vinicius Costa; WIGGER, Leonore; PRADERVAND, Sylvain; FOUILLEN, Laetitia; VAN DELFT, Pierre; GENVA, Manon; MONGRAND, Sébastien; GALLART-AYALA, Hector; IVANISEVIC, Julijana; FANKHAUSER, Christian

doi:10.1038/s41467-022-33384-9

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Nature Communications. 2022-10-10, vol. 13, n° 1

Resumen en inglés

Plant growth ultimately depends on fixed carbon, thus the available light for photosynthesis. Due to canopy light absorption properties, vegetative shade combines low blue (LB) light and a low red to far-red ratio (LRFR). In shade-avoiding plants, these two conditions independently trigger growth adaptations to enhance light access. However, how these conditions, differing in light quality and quantity, similarly promote hypocotyl growth remains unknown. Using RNA sequencing we show that these two features of shade trigger different transcriptional reprogramming. LB induces starvation responses, suggesting a switch to a catabolic state. Accordingly, LB promotes autophagy. In contrast, LRFR induced anabolism including expression of sterol biosynthesis genes in hypocotyls in a manner dependent on PHYTOCHROME-INTERACTING FACTORs (PIFs). Genetic analyses show that the combination of sterol biosynthesis and autophagy is essential for hypocotyl growth promotion in vegetative shade. We propose that vegetative shade enhances hypocotyl growth by combining autophagy-mediated recycling and promotion of specific lipid biosynthetic processes.< Leer menos

Palabras clave en inglés

Arabidopsis

Arabidopsis Proteins

Autophagy

Carbon

Cell Membrane

Gene Expression Regulation

Plant

Hypocotyl

Light

Lipids

Phytochrome

Sterols

URI

https://oskar-bordeaux.fr/handle/20.500.12278/170054

DOI

http://dx.doi.org/10.1038/s41467-022-33384-9

Proyecto ANR

Développement d'une infrastructure française distribuée pour la métabolomique dédiée à l'innovation

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Laboratoire de Biogenèse Membranaire (LBM) - UMR 5200

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A combination of plasma membrane sterol biosynthesis and autophagy is required for shade-induced hypocotyl elongation