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Author Wang J., Wang S., Hu K., Yang J., Xin X., Zhou W., Fan J., Cui F., Mou B., Zhang S., Wang G., Sun W.
Title The Kinase OsCPK4 Regulates a Buffering Mechanism That Fine-Tunes Innate Immunity.
The calcium-dependent protein Kinase OsCPK4 has been demonstrated to play important roles in salt and drought tolerance, plant growth, and development in rice (<i>Oryza sativa</i>). However, little is known about molecular mechanisms underlying OsCPK4 function in rice immunity. In this study, we demonstrated that the generation of oxidative burst and pathogenesis-related gene expression triggered by microbe-associated molecular patterns were significantly enhanced in the <i>OsCPK4</i> mutants. These mutant lines are more resistant to bacterial blight and fungal blast diseases than the wild-type plants, indicating that OsCPK4 negatively regulates innate immunity in rice. OsCPK4 was further identified to interact with a receptor-like cytoplasmic kinase OsRLCK176. OsRLCK176 accumulation is negatively regulated by OsCPK4. Interestingly, the kinase-dead OsCPK4 promotes OsRLCK176 degradation more strongly than the wild-type protein. OsCPK4 and OsRLCK176 mutually phosphorylate each other and form a feedback loop. Moreover, the kinase activity and phosphorylation of OsCPK4 and OsRLCK176 contribute to the stability of OsRLCK176. These findings indicate that the kinase-inactive OsCPK4 promotes OsRLCK176 degradation and restricts plant defenses, whereas the activation of OsCPK4-OsRLCK176 phosphorylation circuit invalidates the OsRLCK176 degradation machinery, thus enhancing plant immunity. Collectively, the study proposes a novel defense buffering mechanism mediated by OsCPK4, which fine-tunes microbe-associated molecular pattern-triggered immunity in rice.
Journal Plant Physiol.
Country China
Volume 176(2)
Pages 1835-1849
Year 2018
PubMed ID 29242377
PubMed Central ID 5813524
DOI 10.1104/pp.17.01024
Strain Wild Core Collection -
Induced Mutation Lines(NIG Collection) -
Sterile Seed Strain -
Lethal Embryo
Mutantion Strain
Stages in Each Organ
- Muant Lines (Gene)
Cultivated Varieties(NIG Collection) -
Stages in Each Organ -