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Updated: Sep 9, 2025

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El PeMAX2 de Populus euphratica contrarresta el PeGRP2 para estabilizar los ARNm objetivo relacionados con la

Jing Li¹, Jun Yao², Siyuan Ma¹

¹Key Laboratory of Forest and Flower Genetics and Breeding of Ministry of Education, College of Biological Science and Biotechnology, Beijing Forestry University, Beijing 100083, China.

Plant science : an international journal of experimental plant biology

|August 30, 2025

Resumen

El estudio revela que la proteína Más Crecimiento Axillar 2 (PeMAX2) degrada la proteína de unión al ARN rica en glicina de Populus euphratica 2 (PeGRP2), mejorando la tolerancia a la sal del álamo al mejorar la homeostasis iónica y la fotosíntesis.

Área de la Ciencia:

Biología vegetal
Biología molecular
Fisiología del estrés

Sus antecedentes:

La proteína de unión al ARN rica en glicina de Populus euphratica 2 (PeGRP2) tiene un impacto negativo en la tolerancia a la sal del álamo al desestabilizar los ARNm.
La regulación post-traducional de PeGRP2 es crucial para comprender su papel en la resistencia a la sal.

Objetivo del estudio:

Investigar la regulación post-traducional del PeGRP2 en el álamo resistente a la sal.
Para aclarar la interacción entre PeGRP2 y más crecimiento axilar 2 (PeMAX2) y su papel en la tolerancia a la sal.

Principales métodos:

Se ha identificado la interacción de PeGRP2 con PeMAX2, una proteína de la caja F.
Se utilizaron ensayos de degradación in vitro y álamos transgénicos (Populus × canescens y P. euphratica) con sobreexpresión de PeMAX2, PeGRP2 o ambos.
Se analizaron la homeostasis iónica, los niveles de especies reactivas de oxígeno (ROS) y los parámetros fotosintéticos.

Principales resultados:

PeMAX2 promueve la degradación de PeGRP2 a través de la vía proteasómica.
La sobreexpresión de PeMAX2 mejora la tolerancia a la sal mediante el mantenimiento de la homeostasis de Na+ y ROS.
PeGRP2 regula negativamente la tolerancia a la sal mediante el deterioro de la fotosíntesis y la homeostasis; PeMAX2 alivia este efecto reduciendo los niveles de PeGRP2.
PeMAX2 contrarresta los efectos negativos de PeGRP2 estabilizando los ARNm diana involucrados en la fotosíntesis y el transporte de iones.

Conclusiones:

El aumento de PeMAX2 en el álamo estresado por sal facilita la degradación de PeGRP2, mitigando su impacto negativo en la tolerancia a la sal.
La vía de señalización PeMAX2-PeGRP2 es un mecanismo clave para la respuesta de la sal en Populus euphratica.

Palabras clave:

Enzima antioxidante Populus × canescens y sus variedades Proteína de unión al ARN rica en glicina 2 Peróxido de hidrógeno más crecimiento axilar 2 fotosíntesis flujo de sodio

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