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Etiolated Seedling Development Requires Repression of Photomorphogenesis by a Small Cell-Wall-Derived Dark Signal.

  • Sinclair SA Department of Molecular Genetics and Physiology of Plants, Ruhr University Bochum, Universitätsstrasse, 44801 Bochum, Germany.
  • Larue C Department of Molecular Genetics and Physiology of Plants, Ruhr University Bochum, Universitätsstrasse, 44801 Bochum, Germany.
  • Bonk L Department of Molecular Genetics and Physiology of Plants, Ruhr University Bochum, Universitätsstrasse, 44801 Bochum, Germany; Geobotany, Ruhr University Bochum, Universitätsstrasse, 44801 Bochum, Germany.
  • Khan A Department of Molecular Genetics and Physiology of Plants, Ruhr University Bochum, Universitätsstrasse, 44801 Bochum, Germany.
  • Castillo-Michel H ID21 Beamline, European Synchrotron Radiation Facility, Avenue des Martyrs, 38043 Grenoble, France.
  • Stein RJ Department of Molecular Genetics and Physiology of Plants, Ruhr University Bochum, Universitätsstrasse, 44801 Bochum, Germany.
  • Grolimund D Swiss Light Source, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland.
  • Begerow D Geobotany, Ruhr University Bochum, Universitätsstrasse, 44801 Bochum, Germany.
  • Neumann U Central Microscopy, Max Planck Institute for Plant Breeding Research, Carl-von-Linné-Weg, 50829 Cologne, Germany.
  • Haydon MJ Department of Molecular Genetics and Physiology of Plants, Ruhr University Bochum, Universitätsstrasse, 44801 Bochum, Germany.
  • Krämer U Department of Molecular Genetics and Physiology of Plants, Ruhr University Bochum, Universitätsstrasse, 44801 Bochum, Germany. Electronic address: ute.kraemer@ruhr-uni-bochum.de.
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  • 2017-11-07
Published in:
  • Current biology : CB. - 2017
JAR1
MUR1
RWA2
TBR
basal zinc tolerance
nickel
oxylipin
pectin acetylation
pectin methylesterification
short oligogalacturonides
Acetyltransferases
Arabidopsis
Arabidopsis Proteins
Cell Wall
Darkness
Etiolation
Gene Expression Regulation, Plant
Genes, Plant
Light Signal Transduction
Morphogenesis
Mutation
Pectins
Seedlings
Signal Transduction
Trichomes
English Etiolated growth in darkness or the irreversible transition to photomorphogenesis in the light engages alternative developmental programs operating across all organs of a plant seedling. Dark-grown Arabidopsis de-etiolated by zinc (dez) mutants exhibit morphological, cellular, metabolic, and transcriptional characteristics of light-grown seedlings. We identify the causal mutation in TRICHOME BIREFRINGENCE encoding a putative acyl transferase. Pectin acetylation is decreased in dez, as previously found in the reduced wall acetylation2-3 mutant, shown here to phenocopy dez. Moreover, pectin of dez is excessively methylesterified. The addition of very short fragments of homogalacturonan, tri-galacturonate, and tetra-galacturonate, restores skotomorphogenesis in dark-grown dez and similar mutants, suggesting that the mutants are unable to generate these de-methylesterified pectin fragments. In combination with genetic data, we propose a model of spatiotemporally separated photoreceptive and signal-responsive cell types, which contain overlapping subsets of the regulatory network of light-dependent seedling development and communicate via a pectin-derived dark signal.
Language
  • English
Open access status
bronze
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https://sonar.ch/global/documents/269008
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