A Ralstonia effector RipAU impairs peanut AhSBT1.7 immunity for pathogenicity via AhPME-mediated cell wall
Kun Chen1,2, Yuhui Zhuang1,3, Hua Chen1,2
1Center for Legume Plant Genetics and Systems Biology, Oil Crops Research Institute, Fujian Agriculture and Forestry University, Fuzhou, 350002, China.
The Plant Journal : for Cell and Molecular Biology
|January 27, 2025
Summary
Ralstonia solanacearum causes bacterial wilt in peanuts. The effector protein RipAU impairs plant defense by targeting AhSBT1.7, revealing a key mechanism for peanut immunity.
Area of Science:
- Plant Pathology
- Molecular Biology
- Biochemistry
Background:
- Bacterial wilt, caused by Ralstonia solanacearum, devastates crops like peanuts.
- Pathogens use type III effector proteins (T3Es) to infect plants.
Purpose of the Study:
- To characterize the role of the T3E RipAU in bacterial wilt pathogenicity.
- To elucidate the interaction between RipAU and peanut proteins involved in plant defense.
Main Methods:
- Genetic manipulation of RipAU and expression of AhSBT1.7 in model plants.
- Analysis of defense gene expression and enzyme activity.
- Protein-protein interaction studies and subcellular localization.
Main Results:
- A mutant RipAU (ΔRipAU) lost pathogenicity, indicating RipAU's crucial role.
- RipAU targets peanut subtilisin-like protease 1.7 (AhSBT1.7), inhibiting plant defense.
- Overexpressing AhSBT1.7 enhanced resistance to R. solanacearum by upregulating defense genes and altering cell wall pectin methylesterase (PME) activity.
- RipAU promotes susceptibility by increasing PME activity, while AhSBT1.7 inhibits it.
Conclusions:
- RipAU virulence relies on inhibiting AhSBT1.7-mediated defense, involving PME-driven cell wall degradation.
- Understanding RipAU pathogenicity and AhSBT1.7 resistance mechanisms offers targets for improving peanut bacterial wilt resistance.
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