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Updated: Jun 21, 2026

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

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Published on: October 1, 2015

Plants under attack: systemic signals in defence.

¹Department of Biological Science, University of North Texas, Denton, TX 76203, USA. shah@unt.edu

Current Opinion in Plant Biology

|July 18, 2009

Summary

This summary is machine-generated.

Plants use vascular and airborne signals for efficient pest defense communication. Key mobile signals like methyl salicylate activate systemic acquired resistance (SAR), while auxins may inhibit these defenses.

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Area of Science:

Plant Biology
Biochemistry
Ecology

Background:

Efficient plant communication is crucial for defense against pests and pathogens.
The vasculature and airborne signals facilitate long-distance communication within plants.
Identifying mobile signals is key to understanding systemic plant immunity.

Purpose of the Study:

To summarize advances in identifying plant systemic defense signals.
To differentiate between positive and negative regulators of systemic acquired resistance (SAR).

Main Methods:

Literature review of recent findings on plant defense signaling.
Analysis of identified mobile metabolites and their roles in SAR.

Main Results:

Methyl salicylate, jasmonates, azelaic acid, and a diterpenoid are candidate mobile signals activating SAR.
These signals confer broad-spectrum resistance against pathogens.
Auxins appear to negatively regulate systemic plant defenses.

Conclusions:

Multiple mobile metabolites mediate systemic acquired resistance in plants.
Understanding these signals enhances strategies for crop protection.
Plant signaling networks are complex, involving both positive and negative regulators.