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La señalización del péptido RALF controla el bloqueo de politubio en Arabidopsis

Sheng Zhong¹, Ling Li¹, Zhijuan Wang¹

¹State Key Laboratory for Protein and Plant Gene Research, Peking-Tsinghua Center for Life Sciences at College of Life Sciences, Peking University, Beijing 100871, People's Republic of China.

Science (New York, N.Y.)

|January 20, 2022

Resumen

Los investigadores identificaron las principales quinasas receptoras y los ligandos péptidos en Arabidopsis que impiden que múltiples tubos de polen lleguen a un óvulo, asegurando una fertilización exitosa. Este mecanismo también controla la ruptura del tubo de polen, optimizando la reproducción de las plantas.

Área de la Ciencia:

Biología de la reproducción vegetal
Ciencias de las plantas moleculares
La señalización celular en la fertilización

Sus antecedentes:

La polispermia, la fertilización por múltiples espermatozoides, causa un desequilibrio letal del genoma y defectos de segregación cromosómica.
En Arabidopsis thaliana, un bloqueo a la polispermia impide la politubia, la llegada de múltiples tubos de polen a un solo óvulo.

Objetivo del estudio:

Para identificar los componentes moleculares responsables del bloqueo politubico en la Arabidopsis thaliana.
Para aclarar el papel de las quinasas receptoras específicas y los ligandos peptídicos en la regulación del comportamiento del tubo de polen durante la fertilización.

Principales métodos:

Interacciones investigadas entre las quinasas similares al receptor de FERONIA, ANJEA y HERCULES RECEPTOR KINASE 1 y los péptidos RALF específicos del tubo de polen (RALF6, 7, 16, 36, 37).
Analizó el papel de estos componentes en el establecimiento del bloque de politubo en el tabique.
Examinó su función en la recepción del tubo de polen y la ruptura dentro del óvulo.

Principales resultados:

FERONIA, ANJEA y HERCULES RECEPTOR KINASE 1 interactúan con los péptidos RALF6, 7, 16, 36 y 37 para establecer el bloqueo del politubio.
Los mismos componentes de señalización regulan la recepción y la ruptura del tubo de polen.
La ruptura del tubo de polen libera el bloque de politubo, lo que permite la aparición de un tubo de polen secundario después del fracaso de la fertilización.

Conclusiones:

Los pasos de fecundación orquestados en *Arabidopsis* están coordinados por componentes de señalización compartidos (receptores quinasa y péptidos RALF).
Esta coordinación asegura y optimiza el éxito reproductivo mediante la prevención de la polispermia y la gestión de los resultados de la fertilización.

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