Cell-type-specific immune programs orchestrate spatial defense in the Arabidopsis leaf epidermis.
Jingpu Song1, Mahsa Modareszadeh1, Dinithi Kumarapeli1
1Department of Biology, University of Saskatchewan, Collaborative Science Research Building, 112 Science Place, Saskatoon, SK, S7N 5E2, Canada.
Nature Communications
|March 22, 2026
Summary
Plant guard cells (GCs) have unique immune roles, distinct from pavement cells, even when lacking salicylic acid (SA) signaling. GCs initiate their own defenses and signal to neighboring cells, showing cell-type-specific plant immunity.
Area of Science:
- Plant immunity
- Cell biology
- Molecular plant pathology
Background:
- Sessile plants depend on cellular defense mechanisms against pathogens.
- Guard cells (GCs) regulate stomatal function but their intrinsic immune roles are unclear.
Purpose of the Study:
- To investigate the distinct immune roles of guard cells (GCs) and pavement cells in Arabidopsis thaliana.
- To understand cell-type-specific immune responses and signaling.
Main Methods:
- Integration of single-cell and spatial transcriptomic analyses.
- Live and fixed imaging of transgenic immune reporters in Arabidopsis leaves.
- Infection assays with powdery mildew, Colletotrichum higginsianum, and Pseudomonas syringae.
Main Results:
- Guard cells (GCs) do not activate salicylic acid (SA) biosynthesis or SA-responsive genes, unlike pavement cells.
- GCs exhibit calcium influx and reactive oxygen species (ROS) bursts, signaling to adjacent cells.
- GCs undergo hypersensitive cell death upon infection with adapted fungal pathogens.
Conclusions:
- Distinct cell-type-specific immune programs exist in plant epidermis.
- Guard cells (GCs) possess autonomous defense mechanisms and contribute to spatial immune coordination.
- Understanding these specialized roles can inform strategies against plant diseases.
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