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

Author

Listed:
  • Yetkin Çaka Ince

    (University of Lausanne)

  • Johanna Krahmer

    (University of Lausanne)

  • Anne-Sophie Fiorucci

    (University of Lausanne)

  • Martine Trevisan

    (University of Lausanne)

  • Vinicius Costa Galvão

    (University of Lausanne)

  • Leonore Wigger

    (University of Lausanne)

  • Sylvain Pradervand

    (University of Lausanne)

  • Laetitia Fouillen

    (Univ. Bordeaux, CNRS, Laboratoire de Biogenèse Membranaire, UMR 5200)

  • Pierre Delft

    (Univ. Bordeaux, CNRS, Laboratoire de Biogenèse Membranaire, UMR 5200)

  • Manon Genva

    (Univ. Bordeaux, CNRS, Laboratoire de Biogenèse Membranaire, UMR 5200
    University of Liège)

  • Sebastien Mongrand

    (Univ. Bordeaux, CNRS, Laboratoire de Biogenèse Membranaire, UMR 5200)

  • Hector Gallart-Ayala

    (University of Lausanne)

  • Julijana Ivanisevic

    (University of Lausanne)

  • Christian Fankhauser

    (University of Lausanne)

Abstract

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.

Suggested Citation

  • Yetkin Çaka Ince & Johanna Krahmer & Anne-Sophie Fiorucci & Martine Trevisan & Vinicius Costa Galvão & Leonore Wigger & Sylvain Pradervand & Laetitia Fouillen & Pierre Delft & Manon Genva & Sebastien , 2022. "A combination of plasma membrane sterol biosynthesis and autophagy is required for shade-induced hypocotyl elongation," Nature Communications, Nature, vol. 13(1), pages 1-17, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-33384-9
    DOI: 10.1038/s41467-022-33384-9
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    References listed on IDEAS

    as
    1. Géraldine Brunoud & Darren M. Wells & Marina Oliva & Antoine Larrieu & Vincent Mirabet & Amy H. Burrow & Tom Beeckman & Stefan Kepinski & Jan Traas & Malcolm J. Bennett & Teva Vernoux, 2012. "A novel sensor to map auxin response and distribution at high spatio-temporal resolution," Nature, Nature, vol. 482(7383), pages 103-106, February.
    2. Martina Legris & Yetkin Çaka Ince & Christian Fankhauser, 2019. "Molecular mechanisms underlying phytochrome-controlled morphogenesis in plants," Nature Communications, Nature, vol. 10(1), pages 1-15, December.
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