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La percepción de péptidos derivados de las raíces por parte de los LRR-RK de los brotes media la señalización

Ryo Tabata¹, Kumiko Sumida¹, Tomoaki Yoshii²

¹Division of Biological Science, Graduate School of Science, Nagoya University, Chikusa, Nagoya 464-8602, Japan.

Science (New York, N.Y.)

|October 18, 2014

Resumen

Las plantas que carecen de nitrógeno en un lado de sus raíces pueden aumentar la absorción de nutrientes en el otro lado. Esta señalización sistémica involucra péptidos secretados por la raíz y leucina recibida por inyección ricas en receptoras repetidas (LRR-RKs) para la adaptación.

Área de la Ciencia:

Biología Vegetal Biología Vegetal
La señalización molecular.
La ingesta de nutrientes en el cuerpo.

Sus antecedentes:

El nitrógeno (N) es esencial para el crecimiento de las plantas, pero la distribución del suelo es a menudo desigual.
Las plantas poseen un mecanismo sistémico para equilibrar la absorción de nitrógeno en sus sistemas radiculares.
La deficiencia local de nitrógeno desencadena la absorción compensatoria en otras partes de la raíz.

Objetivo del estudio:

Para investigar los mecanismos moleculares de la percepción de N en las plantas.
Identificar las vías de señalización de larga distancia involucradas en el desarrollo de las raíces bajo estrés N.
Para entender cómo las plantas se adaptan a la disponibilidad localizada de N.

Principales métodos:

Estudió sistemas moleculares para la percepción de N y la señalización del desarrollo de las raíces.
Se investigó la secreción de péptidos por raíces hambrientas de N.
Se analizó el papel de las leucinas ricas en leucina (LRR-RKs) en la recepción de señales.

Principales resultados:

Las raíces hambrientas de N secretan pequeños péptidos.
Estos péptidos se translocan al brote.
Dos LRR-RKs en el tiro perciben estos péptidos, mediando la señalización N sistémica.
Los mutantes de Arabidopsis deficientes en esta vía exhiben retraso en el crecimiento y síntomas de deficiencia de N.

Conclusiones:

Una vía de señalización de raíz a brote permite a las plantas adaptarse a las fluctuaciones locales de N.
La señalización de péptidos a través de LRR-RKs es crucial para la homeostasis sistémica de N.
Este mecanismo mejora la supervivencia y el crecimiento de las plantas en entornos de nutrientes variables.

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