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Bacterial Leaf Infiltration Assay for Fine Characterization of Plant Defense Responses using the Arabidopsis thaliana-Pseudomonas syringae Pathosystem
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Bacterial Leaf Infiltration Assay for Fine Characterization of Plant Defense Responses using the Arabidopsis thaliana-Pseudomonas syringae Pathosystem

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Phosphorylation-mediated inactivation of C3H14 by MPK4 enhances bacterial-triggered immunity in Arabidopsis

Dian Wang1,2, Guohua Chai2,3, Li Xu3

  • 1College of Agronomy, Qingdao Agricultural University, Qingdao 266109, China.

Plant Physiology
|June 23, 2022
PubMed

Insights

Mitogen-activated protein kinase 4 (MPK4) inactivates the CCCH protein C3H14 through phosphorylation, enhancing plant immunity. This MPK4-C3H14 interaction regulates PAMP-triggered immunity and systemic acquired resistance in Arabidopsis.

Area of Science:

  • Plant immunity
  • Molecular plant-microbe interactions
  • Signal transduction

Background:

  • Pathogen-associated molecular patterns (PAMPs) trigger plant immune responses via signaling pathways.
  • Mitogen-activated protein kinase 4 (MPK4) is crucial for plant defense, but its precise mechanisms remain unclear.
  • CCCH-type zinc finger proteins play roles in plant development and stress responses.

Purpose of the Study:

  • To elucidate the role of the CCCH protein C3H14 in the MPK4-mediated plant immune pathway.
  • To investigate the regulatory mechanism of C3H14 by MPK4 during PAMP-triggered immunity (PTI) and systemic acquired resistance (SAR).

Main Methods:

  • Genetic analysis using loss-of-function mutants and overexpression lines of C3H14 and C3H15 in Arabidopsis thaliana.
  • Pathogen challenge assays with Pseudomonas syringae pv. tomato DC3000 (Pst DC3000).
  • Analysis of gene expression related to PTI and SAR, including NIMIN1 and NIMIN2.
  • Phosphorylation assays to determine MPK4-mediated C3H14 modification.

Main Results:

  • Loss-of-function mutations in C3H14 and C3H15 enhanced resistance to Pst DC3000 and induced SAR.
  • Overexpression of C3H14 or C3H15 increased susceptibility and impaired SAR.
  • MPK4 phosphorylates and inactivates C3H14, relieving its inhibition on PTI-related genes and attenuating its activation of SAR repressors NIMIN1/2.
  • Salicylic acid signaling pathways are influenced by MPK4-C3H14 cascades.

Conclusions:

  • C3H14 acts as a negative regulator in the MPK4 defense signaling pathway.
  • MPK4-mediated phosphorylation of C3H14 is essential for effective PTI and SAR in Arabidopsis.
  • The MPK4-C3H14 module represents a key regulatory node in plant immunity.

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