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A peptide-receptor module links cell wall integrity sensing to pattern-triggered immunity.

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Summary

Plants use cell wall integrity sensors to detect damage and activate immunity. The SCOOP18-MIK2 module is a key player, linking cell wall sensing to defense responses in Arabidopsis.

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Area of Science:

  • Plant biology
  • Molecular plant pathology
  • Cell wall signaling

Background:

  • Plants possess cell-surface receptors to detect external cues, including cell wall integrity.
  • Cell wall damage can trigger plant immune responses, but the underlying molecular mechanisms are not fully understood.

Purpose of the Study:

  • To identify the specific ligand-receptor module involved in sensing cell wall damage and potentiating immunity in Arabidopsis.
  • To elucidate the role of MALE DISCOVERER 1-INTERACTING RECEPTOR-LIKE KINASE 2 (MIK2) and the SERINE RICH ENDOGENOUS PEPTIDE (SCOOP) family in this process.

Main Methods:

  • Investigated transcriptional changes in response to cell wall integrity disruption via cellulose biosynthesis inhibition.
  • Utilized genetic approaches to assess the dependency on MIK2 and specific SCOOP peptides.
  • Analyzed downstream responses including lignification and immunity potentiation.

Main Results:

  • Cell wall damage triggers pattern-triggered immunity in an MIK2-dependent manner.
  • SCOOP18, a member of the SERINE RICH ENDOGENOUS PEPTIDE family, is induced by cell wall damage.
  • SCOOP18 is essential for subsequent responses like lignification and immunity potentiation.

Conclusions:

  • The SCOOP18-MIK2 ligand-receptor module acts as a central hub connecting plant cell wall integrity sensing to immunity.
  • This discovery provides a molecular link between mechanical stress perception and plant defense activation.