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The Danger-Associated Peptide PEP1 Directs Cellular Reprogramming in the Arabidopsis Root Vascular System.

Souvik Dhar1, Hyoujin Kim1, Cécile Segonzac2,3,4

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The plant immune peptide PEP1 alters root vascular development by affecting stele cell division and xylem differentiation. This occurs through blocking symplastic connections and increasing callose deposition in Arabidopsis roots.

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Area of Science:

  • Plant Biology
  • Molecular Plant-Pathogen Interactions
  • Plant Development

Background:

  • Plants perceive microbe-associated molecular patterns (MAMPs) and damage-associated molecular patterns (DAMPs), triggering altered root growth.
  • While flg22 (MAMP) and PEP1 (DAMP) affect root length and root hairs, their impact on vascular development is unknown.
  • PEP1 receptors (PEPR1, PEPR2) are highly expressed in the root vascular system, unlike flg22/elf18 receptors.

Purpose of the Study:

  • To investigate the effect of the DAMP peptide PEP1 on root vascular tissue development in Arabidopsis.
  • To explore the cellular and molecular mechanisms underlying PEP1-mediated vascular changes.

Main Methods:

  • Exogenous application of PEP1 to Arabidopsis roots.
  • Microscopic analysis of stele cell division and xylem vessel formation.
  • Assessment of symplastic transport using free green fluorescence protein (GFP).
  • Callose deposition analysis.

Main Results:

  • PEP1 significantly reduced stele cell division and altered xylem vessel differentiation.
  • PEP1 application blocked symplastic transport of GFP from phloem sieve elements.
  • Increased callose deposition was observed between cells, indicating disrupted symplastic connections.
  • PEP1's effects were consistent with its receptor expression patterns in the vascular system.

Conclusions:

  • PEP1 plays a crucial role in regulating root vascular tissue development.
  • PEP1 induces cellular reprogramming within the Arabidopsis root vascular system.
  • Disruption of symplastic connections and callose deposition are key mechanisms in PEP1-mediated vascular changes.