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Una hoja de ruta de transcripción del ciclo de crecimiento anual en los árboles de Populus

Alice Marcon¹, Laura García Romañach¹, Domenique André¹

¹Umeå Plant Science Centre, Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences, 901 83 Umeå, Sweden.

|August 20, 2025

Resumen

Este estudio mapea la expresión génica anual en los árboles Populus, revelando procesos moleculares estacionales. Una nueva aplicación, POPUL-R, permite a los investigadores explorar estas dinámicas de crecimiento de los árboles.

Área de la Ciencia:

Biología molecular de las plantas
Ecología forestal
La genómica

Sus antecedentes:

Las especies de Populus exhiben una notable adaptación a los entornos boreales con distintas fluctuaciones estacionales.
Los cambios ambientales desencadenan respuestas moleculares en los árboles, regulando procesos críticos de desarrollo durante todo el año.

Objetivo del estudio:

Crear una hoja de ruta de transcripción completa del ciclo de crecimiento anual de los árboles Populus.
Identificar núcleos genéticos y procesos moleculares específicos de los cambios estacionales en el desarrollo de los árboles.
Para comparar los patrones de expresión génica entre los árboles cultivados al aire libre y en entornos controlados.

Principales métodos:

Se realizó la secuenciación de ARN en 207 muestras de Populus tremula y Populus tremula x tremuloides híbrido T89.
Los árboles se cultivaron al aire libre en diferentes etapas anuales y en condiciones controladas que simulan los cambios estacionales.
Se utilizaron análisis de redes de coexpresión para identificar módulos con perfiles de expresión estacionales.

Principales resultados:

Se estableció una hoja de ruta transcripcional completa del ciclo de crecimiento anual de Populus.
36 de los 46 módulos de coexpresión identificados mostraron patrones de expresión estacionales, con muchos imitados en condiciones controladas.
Las diferencias significativas en los módulos de expresión génica entre las condiciones al aire libre y las controladas destacan las limitaciones de los entornos artificiales.

Conclusiones:

Los cambios ambientales estacionales impulsan procesos moleculares distintos en los árboles Populus.
Los experimentos controlados pueden pasar por alto aspectos cruciales de la regulación del crecimiento en comparación con las condiciones naturales al aire libre.
La aplicación POPUL-R Shiny proporciona una herramienta valiosa y accesible para explorar la expresión génica del árbol y las interacciones de red.

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