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Related Experiment Video

Updated: Apr 6, 2026

Bacterial Leaf Infiltration Assay for Fine Characterization of Plant Defense Responses using the Arabidopsis thaliana-Pseudomonas syringae Pathosystem
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Prosystemin-derived signals: bridging leaf microbiome dynamics and defense activation.

Valeria Castaldi1,2, Wisnu Adi Wicaksono3, Martina Chiara Criscuolo4

  • 1Department of Agricultural Sciences, University of Naples "Federico II", Portici, Italy. valeria.castaldi@yale.edu.

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Summary

Plant peptides boost crop protection by altering leaf microbes and volatile compounds. This study shows a Prosystemin-derived peptide shifts the tomato phyllosphere microbiome and activates defense metabolism.

Keywords:
Jasmonic acidPhyllospherePlant microbiomeShotgun metagenomicsSignaling peptideVOCs

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Area of Science:

  • Plant Science
  • Microbiology
  • Biochemistry

Background:

  • Plant-derived peptides are promising for sustainable crop protection.
  • Their effects on plant-associated microbiomes are not fully understood.

Purpose of the Study:

  • Investigate the impact of a Prosystemin-derived peptide on the tomato phyllosphere microbiome.
  • Analyze changes in the leaf volatilome.

Main Methods:

  • Foliar peptide application biweekly.
  • Shotgun metagenomic sequencing and qPCR for microbiome analysis.
  • Volatilome analysis.

Main Results:

  • Peptide treatment significantly shifted bacterial community structure, reducing diversity.
  • Increased abundance of genera like Acinetobacter, Sphingobium, and Sphingomonas.
  • Elevated monoterpene emissions, indicating activated defense metabolism.

Conclusions:

  • The Prosystemin-derived peptide influences plant responses and interactions with microbiota.
  • Sphingomonadaceae, particularly Sphingobium yanoikuyae, may persist under peptide treatment.
  • Further research is needed to confirm causal mechanisms.