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Evaluating Leaf Responses to Microbial Secondary Metabolites Using A High-Throughput Format

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Published on: December 5, 2025

Surfactin Structural Variants Differentially Modulate Plant Immune Responses.

Ning Ding¹, Hansong Dong², Romain Thomas¹

¹Microbial Processes and Interactions (MiPI) Laboratory, TERRA Teaching and Research Centre, Gembloux Agro-Bio Tech, University of Liège, B-5030 Gembloux, Belgium.

|October 29, 2025

Summary

Cyclic lipopeptides (CLPs) from beneficial bacteria can boost plant immunity. Their structural features dictate how they trigger plant defenses, offering potential for new agricultural biocontrol agents.

Keywords:

Bacillus licheniformis Bacillus pumilus Bacillus velezensis cyclic lipopeptides early immune responses induced systemic resistance reactive oxygen and nitrogen species

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Area of Science:

Plant-microbe interactions
Biochemistry
Agricultural science

Background:

Cyclic lipopeptides (CLPs) from rhizobacteria like Bacillus and Pseudomonas show promise as biocontrol agents.
CLPs exhibit antimicrobial properties and can elicit plant immunity and systemic resistance.
The molecular mechanisms and structural influences on CLP-mediated plant immune responses are not fully understood.

Purpose of the Study:

To investigate how structural features of surfactin-type CLPs affect plant immune responses.
To elucidate the role of calcium signaling in CLP-induced nitric oxide (NO) production.
To explore the evolutionary basis of plant-microbe interactions through CLP structure-function relationships.

Main Methods:

Treatment of Arabidopsis thaliana roots with specific surfactin-type CLPs.
Measurement of early plant immune responses, including reactive oxygen species (ROS) bursts, NO production, and calcium fluxes.
Analysis of systemic resistance induction.

Main Results:

Specific structural features of surfactin-type CLPs were found to critically influence the triggering of plant immune responses.
Surfactin-induced NO generation in Arabidopsis roots was shown to depend on calcium signaling.
Contrasting immune effects of CLPs correlate with the ecological lifestyles of their microbial producers.

Conclusions:

CLP structural variation is crucial for modulating plant defense responses.
Understanding CLP structure-activity relationships can guide the development of novel, biosourced plant protectants.
CLPs represent a promising avenue for developing next-generation agricultural biocontrol agents with broad-spectrum efficacy.