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snRNA-Seq Unveils Cell-Type-Specific Immune Dynamics in Arabidopsis During Pinewood Nematode Infection
Meiling Wang1, Xiehai Song2, Zhiyuan Jiao1
1State Key Laboratory of Tree Genetics and Breeding, National Engineering Research Center of Tree Breeding and Ecological Restoration, College of Biological Sciences and Technology, Beijing Forestry University, Beijing, China.
Molecular Plant Pathology
|August 19, 2025
Summary
Plant immune responses to pinewood nematode (PWN) infection involve distinct cell types. A key finding shows AtWRKY70 enhances plant defense by regulating AtPNP-A, offering insights into pine tree resistance to this pathogen.
Area of Science:
- Plant Pathology
- Molecular Biology
- Genetics
Background:
- Plant-pathogen interactions are crucial for understanding disease resistance and susceptibility.
- The specific cellular mechanisms governing the interaction between pinewood nematode (PWN) and its host plants are not well understood.
Purpose of the Study:
- To investigate the cell-type-specific immune responses of Arabidopsis during PWN infection using single-nucleus RNA sequencing (snRNA-seq).
- To elucidate the molecular mechanisms underlying plant defense against PWN, focusing on gene regulation.
Main Methods:
- Single-nucleus RNA sequencing (snRNA-seq) was performed on PWN-infected Arabidopsis leaves.
- Differential gene expression analysis was conducted to identify cell-type-specific responses.
- Molecular assays were used to validate the regulatory role of specific genes.
Main Results:
- Four distinct cell types showed varied immune responses to PWN infection.
- Mesophyll and epidermal cells exhibited dynamic shifts in immune-active subpopulations.
- AtWRKY70 was identified as a positive regulator of plant defense against PWN, acting via salicylic acid-dependent suppression of AtPNP-A promoter activity.
Conclusions:
- This study reveals novel insights into the heterogeneous cellular immune responses to PWN infection in plants.
- The findings highlight the regulatory role of AtWRKY70 in plant defense and provide a basis for identifying pine resistance genes against PWN.
