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Signals from the cuticle affect epidermal cell differentiation.

Susannah M Bird1, Julie E Gray2

  • 1Department of Animal and Plant Science, University of Sheffield, Sheffield S10 2TN, UK.

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|April 20, 2021
PubMed
Summary
This summary is machine-generated.

Arabidopsis cuticle wax influences epidermal cell fate, affecting stomatal and trichome development. Environmental factors like CO2 levels can alter these processes through cuticle composition changes.

Keywords:
epidermisguard cellstomatatrichomevery long chain fatty acidwaxCuticle

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Area of Science:

  • Plant biology
  • Developmental biology
  • Biochemistry

Background:

  • The aerial epidermis of plants is covered by a waxy cuticle crucial for cell fate control.
  • Mutations affecting cuticular wax biosynthesis in Arabidopsis (e.g., cer mutants) impact both wax composition and stomatal numbers.
  • Environmental factors, such as elevated CO2, can influence stomatal development, potentially mediated by cuticle composition.

Purpose of the Study:

  • To investigate the role of cuticular wax biosynthesis in regulating epidermal cell fate, specifically stomatal and trichome development in Arabidopsis.
  • To explore how environmental cues, like CO2 concentration, interact with cuticle composition to influence plant development.
  • To determine if components of the cuticle act as signaling molecules or mediators for developmental signals.

Main Methods:

  • Analysis of Arabidopsis mutants with defects in wax biosynthesis (cer, hic, FDH, LCR).
  • Phenotypic characterization of mutants, focusing on cuticular wax composition, stomatal number, and trichome development.
  • Observation of mutant responses under varying environmental conditions, including elevated CO2 concentrations.

Main Results:

  • Wax biosynthesis mutants (cer) show altered wax composition and increased stomatal numbers.
  • The HIC gene, involved in wax biosynthesis, affects stomatal numbers subtly, particularly at elevated CO2 levels.
  • Mutations in FDH and LCR genes impact trichome development, suggesting cuticle composition influences both stomatal and trichome patterning.

Conclusions:

  • Cuticular wax composition plays a significant role in determining epidermal cell fate, influencing both stomatal and trichome development in Arabidopsis.
  • Environmental factors can modulate developmental pathways through changes in cuticle composition.
  • The cuticle may serve as a signaling medium or contain signaling molecules that regulate epidermal development.