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A two-way molecular dialogue between embryo and endosperm required for seed development

N. M. Doll, S. Royek, S. Fujita, S. Okuda, A. Stintzi, View ORCID ProfileT. Widiez, M. Hothorn, A. Schaller, N. Geldner, G. Ingram
doi: https://doi.org/10.1101/809368
N. M. Doll
Laboratoire Reproduction et Développement des Plantes, University of Lyon, ENS de Lyon, UCB Lyon 1, CNRS, INRA, F-69342, Lyon, France
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S. Royek
Department of Plant Physiology and Biochemistry, University of Hohenheim, Stuttgart, Germany
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S. Fujita
Department of Plant Molecular Biology, University of Lausanne, 1015 Lausanne, Switzerland
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S. Okuda
Structural Plant Biology Laboratory, Department of Botany and Plant Biology, University of Geneva, 1211 Geneva, Switzerland
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A. Stintzi
Department of Plant Physiology and Biochemistry, University of Hohenheim, Stuttgart, Germany
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T. Widiez
Laboratoire Reproduction et Développement des Plantes, University of Lyon, ENS de Lyon, UCB Lyon 1, CNRS, INRA, F-69342, Lyon, France
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  • ORCID record for T. Widiez
M. Hothorn
Structural Plant Biology Laboratory, Department of Botany and Plant Biology, University of Geneva, 1211 Geneva, Switzerland
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A. Schaller
Department of Plant Physiology and Biochemistry, University of Hohenheim, Stuttgart, Germany
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N. Geldner
Department of Plant Molecular Biology, University of Lausanne, 1015 Lausanne, Switzerland
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G. Ingram
Laboratoire Reproduction et Développement des Plantes, University of Lyon, ENS de Lyon, UCB Lyon 1, CNRS, INRA, F-69342, Lyon, France
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  • For correspondence: gwyneth.ingram@ens-lyon.fr
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Abstract

The plant embryonic cuticle is a hydrophobic barrier deposited de novo by the embryo during seed development. At germination it protects the seedling from water loss and is thus critical for survival. Embryonic cuticle formation is controlled by a signaling pathway involving the protease ALE1 and the receptor-like kinases GSO1 and GSO2. We show that a sulfated peptide, TWISTED SEED1 (TWS1) acts as a GSO1/GSO2 ligand. Cuticle surveillance depends on the action of ALE1 which, unlike TWS1 and GSO1/2, is not produced in the embryo but in the neighboring endosperm. Cleavage of an embryo-derived TWS1 precursor by ALE1 releases the active peptide, triggering GSO1/2-dependent cuticle reinforcement in the embryo. A bidirectional molecular dialogue between embryo and endosperm thus safeguards cuticle integrity prior to germination.

One Sentence Summary Subtilase-mediated activation of the TWISTED SEED1 peptide provides spatial cues during embryo cuticle integrity monitoring.

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Posted October 17, 2019.
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A two-way molecular dialogue between embryo and endosperm required for seed development
N. M. Doll, S. Royek, S. Fujita, S. Okuda, A. Stintzi, T. Widiez, M. Hothorn, A. Schaller, N. Geldner, G. Ingram
bioRxiv 809368; doi: https://doi.org/10.1101/809368
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A two-way molecular dialogue between embryo and endosperm required for seed development
N. M. Doll, S. Royek, S. Fujita, S. Okuda, A. Stintzi, T. Widiez, M. Hothorn, A. Schaller, N. Geldner, G. Ingram
bioRxiv 809368; doi: https://doi.org/10.1101/809368

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