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Plant PI4P is required for bacteria to translocate type-3 effectors
Jinfeng Peng1,2, Liyuan Zhang1, Kai Lu1
1College of Plant Protection, State Key Laboratory of Wheat Improvement, Shandong Agricultural University, Taian, 271018, China.
The New Phytologist
|November 21, 2024
Summary
Plant cell membranes require phosphatidylinositol 4-phosphate (PI4P) for bacterial type-3 effector (T3E) translocation. This PI4P-dependent process is crucial for pathogen virulence and plant immunity, impacting bacterial infection strategies.
Area of Science:
- Plant-microbe interactions
- Molecular plant pathology
- Bacterial pathogenesis
Background:
- Type-3 effectors (T3E) from Gram-negative bacteria mediate virulence or immunity in plants post-translocation.
- The molecular mechanisms governing T3E translocation into plant cells remain incompletely understood.
Purpose of the Study:
- To investigate the role of plant cell membrane lipids in the translocation of bacterial T3E.
- To validate the hypothesis that lipidic compounds are essential for T3E translocation.
Main Methods:
- Genetic, molecular, and biochemical assays were employed.
- Experiments involved bacterial pathogens like Xanthomonas oryzae and Pseudomonas syringae.
- Plant models included Oryza sativa and Nicotiana benthamiana.
Main Results:
- Phosphatidylinositol 4-phosphate (PI4P) in plant cell membranes is essential for T3E translocation.
- PI4P cooperates with the type-3 translocase HrpF to facilitate effector movement.
- Suppression of PI4P significantly inhibits T3E translocation and bacterial infection.
Conclusions:
- Bacterial T3E translocation into plant cells is dependent on PI4P.
- The HrpF-PI4P interaction is a conserved mechanism in plant-bacterial interactions.
- Targeting PI4P offers a potential strategy to control bacterial plant diseases.
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