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Science. 2020 Jan 24;367(6476):431-435. doi: 10.1126/science.aaz4131.

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

Author information

1
Laboratoire Reproduction et Développement des Plantes, University of Lyon, ENS de Lyon, UCB Lyon 1, CNRS, INRAE, F-69342, Lyon, France.
2
Department of Plant Physiology and Biochemistry, University of Hohenheim, 70599 Stuttgart, Germany.
3
Department of Plant Molecular Biology, University of Lausanne, 1015 Lausanne, Switzerland.
4
Structural Plant Biology Laboratory, Department of Botany and Plant Biology, University of Geneva, 1211 Geneva, Switzerland.
5
Laboratoire Reproduction et Développement des Plantes, University of Lyon, ENS de Lyon, UCB Lyon 1, CNRS, INRAE, F-69342, Lyon, France. gwyneth.ingram@ens-lyon.fr.
#
Contributed equally

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 ABNORMAL LEAF SHAPE1 subtilase and the two GASSHO receptor-like kinases. We show that a sulfated peptide, TWISTED SEED1 (TWS1), acts as a GASSHO ligand. Cuticle surveillance depends on the action of the subtilase, which, unlike the TWS1 precursor and the GASSHO receptors, is not produced in the embryo but in the neighboring endosperm. Subtilase-mediated processing of the embryo-derived TWS1 precursor releases the active peptide, triggering GASSHO-dependent cuticle reinforcement in the embryo. Thus, a bidirectional molecular dialogue between embryo and endosperm safeguards cuticle integrity before germination.

PMID:
31974252
DOI:
10.1126/science.aaz4131

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