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

Doll, N M
Royek, S
Fujita, S
Chamot, S
Stintzi, A
Widiez, T
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Published in Science. 2020, vol. 367, no. 6476, p. 431-435
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.
Keywords Amino Acid SequenceEndosperm/cytology/metabolism/physiologyGerminationLigandsPlant Proteins/chemistry/metabolismProtein Kinases/chemistry/metabolismSeeds/cytology/metabolism/physiologySerine Endopeptidases/chemistry/metabolismSignal TransductionTobacco/growth & development/metabolism
PMID: 31974252
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Article (Accepted version) (4.7 MB) - public document Free access
Research group Groupe Hothorn
Swiss National Science Foundation: 31003A_176237
Autre: HHMI International Research Scholar Award
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DOLL, N M et al. A two-way molecular dialogue between embryo and endosperm is required for seed development. In: Science, 2020, vol. 367, n° 6476, p. 431-435. doi: 10.1126/science.aaz4131 https://archive-ouverte.unige.ch/unige:140497

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Deposited on : 2020-08-31

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