| Categories genes  | Tags Salt Sensitivity  Kinase  ethylene homeostasis  root epidermal cells  ethylene production  reactive oxygen species  growth  salt  salt stress  stress  plant growth  protein phosphatase 
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  • Key message
    • The Receptor-Like Kinase SIT1 Mediates Salt Sensitivity by Activating MAPK3/6 and Regulating Ethylene Homeostasis in Rice
    • Here, we demonstrate that rice (Oryza sativa) Salt Intolerance 1 (SIT1), a lectin receptor-like kinase expressed mainly in root epidermal cells, mediates salt sensitivity.
    • SIT1 mediates ethylene production and salt-induced ethylene signaling. SIT1 promotes accumulation of reactive oxygen species (ROS), leading to growth inhibition and plant death under salt stress, which occurred in an MPK3/6- and ethylene signaling-dependent manner in Arabidopsis thaliana.
    • Consequently, by blocking SIT1 phosphorylation, B’κ inhibits and fine tunes SIT1 activity to balance plant growth and stress adaptation
    • Mutual regulation of receptor-like kinase SIT1 and B’κ-PP2A shapes the early response of rice to salt stress.
    • The receptor-like kinase SIT1 acts as a sensor in rice roots, relaying salt stress signals via elevated kinase activity to enhance salt sensitivity
    • Here, we demonstrate that Protein Phosphatase 2A (PP2A) regulatory subunit B’κ constrains SIT1 activity under salt stress
    • During early salt stress, activated SIT1 phosphorylates B’κ; this not only enhances its binding with SIT1, it also promotes B’κ protein accumulation via Ser502 phosphorylation
    • B’κ-PP2A deactivates SIT1 directly by dephosphorylating the kinase at Thr515/516, a salt-induced phosphorylation site in the activation loop that is essential for SIT1 activity
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