Journal
SCIENCE
Volume 367, Issue 6476, Pages 431-+Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aaz4131
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Funding
- French Agence National de Recherche [ANR-17-CE20-0027]
- Swiss National Science Foundation (NSF)
- Ministere de l'Enseignement Superieur et de la Recherche
- NSR [31003A_176237]
- Howard Hughes Medical Institute
- Human Frontier Science Program (HFSP)
- Carl-Zeiss Foundation
- Agence Nationale de la Recherche (ANR) [ANR-17-CE20-0027] Funding Source: Agence Nationale de la Recherche (ANR)
- Swiss National Science Foundation (SNF) [31003A_176237] Funding Source: Swiss National Science Foundation (SNF)
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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.
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