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Related Experiment Video

Updated: Jul 10, 2026

Bacterial Leaf Infiltration Assay for Fine Characterization of Plant Defense Responses using the Arabidopsis thaliana-Pseudomonas syringae Pathosystem
11:50

Bacterial Leaf Infiltration Assay for Fine Characterization of Plant Defense Responses using the Arabidopsis thaliana-Pseudomonas syringae Pathosystem

Published on: October 1, 2015

Interplay between MAMP-triggered and SA-mediated defense responses.

Kenichi Tsuda1, Masanao Sato, Jane Glazebrook

  • 1Department of Plant Biology, Microbial and Plant Genomics Institute, University of Minnesota, 1500 Gortner Avenue, St Paul, MN 55108, USA.

The Plant Journal : for Cell and Molecular Biology
|November 17, 2007
PubMed
Summary

Plant immune responses involve microbe-associated molecular patterns (MAMPs) and salicylic acid (SA)-mediated defenses. This study reveals MAMPs trigger SA accumulation, crucial for plant immunity against pathogens like Pseudomonas syringae pv. tomato DC3000.

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Assay for Pathogen-Associated Molecular Pattern (PAMP)-Triggered Immunity (PTI) in Plants
08:45

Assay for Pathogen-Associated Molecular Pattern (PAMP)-Triggered Immunity (PTI) in Plants

Published on: September 9, 2009

Area of Science:

  • Plant immunity
  • Molecular plant-pathogen interactions
  • Plant signaling pathways

Background:

  • Plants possess innate immunity with two main recognition mechanisms: microbe-associated molecular patterns (MAMPs) and resistance (R) genes.
  • Salicylic acid (SA)-mediated responses are key to R gene-mediated defense, showing overlaps with MAMP-triggered immunity.
  • The precise interactions between MAMP-triggered and SA-mediated signaling pathways remain incompletely understood.

Purpose of the Study:

  • To investigate the intricate interactions between MAMP-triggered and SA-mediated signaling pathways in plant immunity.
  • To elucidate the role of SA accumulation in response to MAMPs and its impact on defense gene expression.
  • To determine the contribution of SA signaling to plant resistance against bacterial pathogens.

Main Methods:

  • Treatment with a MAMP (flg22) and inoculation with a Pseudomonas syringae pv. tomato DC3000 (PstDC3000) hrcC mutant (TTSS-deficient).
  • Monitoring of SA accumulation and defense gene expression profiling.
  • Analysis of MAMP-triggered responses in mutants defective in SA signaling components (SID2, PAD4).

Main Results:

  • SA levels significantly increased 6 hours after MAMP treatment or inoculation with PstDC3000 hrcC.
  • Disruptions in SA signaling components (SID2, PAD4) markedly impaired MAMP-triggered responses.
  • Two distinct gene expression patterns were observed in response to PstDC3000 hrcC, with some genes showing SA-dependent induction over time.
  • Strong resistance to PstDC3000 hrcC was dependent on SA signaling.

Conclusions:

  • MAMP perception triggers a significant increase in SA, which is a critical component of MAMP-triggered immunity.
  • SA-dependent signaling pathways are integral to the plant's response to MAMPs and contribute to resistance against pathogens.
  • These findings explain the observed overlaps between MAMP-triggered and SA-mediated immune responses.