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FERONIA quinasa y PP2A regulan de forma antagónica la tolerancia a la sal en Arabidopsis

Jianwei Liu¹, Mingtao Wang², Xin Liu¹

¹State Key Laboratory of Plant Trait Design, Shanghai Center for Plant Stress Biology, CAS Center for Excellence in Molecular Plant Sciences, Chinese Academy of Sciences, Shanghai 200032, China.

Current biology : CB

|December 20, 2025

Resumen

La interacción de la extensina rica en leucina (LRX) 3/4/5 y FERONIA (FER) con la proteína fosfatasa 2A (PP2A) regula la tolerancia a la sal en plantas. Este estudio revela un bucle de retroalimentación que controla la actividad de la quinasa FER y el transporte de auxinas para la adaptación a la sal.

Área de la Ciencia:

Biología Vegetal
Ciencia Molecular de Plantas
Fisiología del Estrés

Sus antecedentes:

Las extensinas ricas en leucina (LRX) 3/4/5 y FERONIA (FER) son cruciales para la tolerancia a la sal en plantas.
Los mecanismos que vinculan LRX3/4/5, FER y la respuesta al estrés salino no se comprenden completamente.

Objetivo del estudio:

Elucidar cómo LRX3/4/5 modulan la actividad de FER bajo estrés salino.
Identificar reguladores clave de la actividad de la quinasa FER en las vías de tolerancia a la sal.

Principales métodos:

Análisis mutacional de lrx345 y fer-4.
Inmunoprecipitación-espectrometría de masas (IP-MS) para identificar interacciones proteicas.
Ensayos bioquímicos para evaluar la actividad de quinasas y fosfatasas.
Análisis de la fosforilación de PIN3 y el transporte de auxinas.

Principales resultados:

Las mutaciones lrx345 disminuyen la actividad de la quinasa FER, reflejando los fenotipos de fer-4.
FER interactúa con la proteína fosfatasa 2A (PP2A) y es desfosforilada por esta.
PP2A actúa como un regulador negativo de la actividad de la quinasa FER; su alteración rescata la hipersensibilidad a la sal de lrx345.
La fosforilación de FER inhibe la actividad de PP2A, formando un bucle de retroalimentación.
FER y PP2A regulan la tolerancia a la sal modulando la fosforilación de PIN3 y el transporte de auxinas.

Conclusiones:

Un par antagónico de quinasa-fosfatasa (FER-PP2A) ajusta finamente la tolerancia a la sal en plantas.
Este mecanismo regulatorio optimiza la adaptación de las plantas al estrés salino a través de la señalización dependiente de la fosforilación.
El eje FER-PP2A-PIN3 es crítico para el manejo de las respuestas al estrés salino en plantas.

Palabras clave:

FERONIA PIN3 PP2A auxina fosforilación quinasa receptora estrés salino

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