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VND Genes Redundantly Regulate Cell Wall Thickening during Parasitic Nematode Infection
Saki Gushino1, Allen Yi-Lun Tsai1,2, Misato Otani3,4
1Graduate School of Science and Technology, Kumamoto University, 2-39-1 Kurokami, Kumamoto, 860-8555 Japan.
Plant & Cell Physiology
|April 25, 2024
Summary
Plant-parasitic root-knot nematodes form specialized feeding cells with thickened, pitted cell walls. Genes like VND1, VND2, and VND3 are key in this process, impacting nematode reproduction.
Area of Science:
- Plant Pathology
- Molecular Biology
- Genetics
Background:
- Root-knot nematodes are significant agricultural pests causing crop damage worldwide.
- These nematodes induce specialized giant cells (GCs) in plant roots for nutrient uptake.
Purpose of the Study:
- To investigate the role of vascular-related NAC-domain (VND) genes in giant cell development and plant-nematode interactions.
- To explore the relationship between giant cell wall formation and plant xylem differentiation pathways.
Main Methods:
- Analysis of gene expression, including VND1 and XYLEM CYSTEINE PEPTIDASE 1, during nematode infection.
- Phenotypic characterization of vnd2 and vnd3 mutants, and the vnd1 vnd2 vnd3 triple mutant.
- Quantification of nematode egg masses in wild-type and mutant plants.
Main Results:
- Giant cell walls develop pitted patterns resembling metaxylem.
- VND1 is upregulated, while a xylem cell death marker is downregulated during infection.
- VND gene mutants exhibit altered secondary cell wall pore size and reduced nematode egg masses.
Conclusions:
- The giant cell development pathway shares signaling modules with metaxylem differentiation.
- VND1, VND2, and VND3 redundantly regulate plant-nematode interactions via secondary cell wall formation.
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