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PEP1 regula la floración perenne en el Arabis alpina

Renhou Wang¹, Sara Farrona, Coral Vincent

¹Max Planck Institute for Plant Breeding Research, Carl von Linne Weg 10, D-50829 Cologne, Germany.

|April 17, 2009

Resumen

Las plantas perennes como Arabis alpina florecen estacionalmente debido al gen de floración perpetua 1 (pep1). Este gen es este gen.

Área de la Ciencia:

Biología vegetal Biología vegetal
Genética molecular genética molecular.
Botánica evolutiva en la botánica evolutiva.

Sus antecedentes:

Las plantas anuales completan su ciclo de vida en un año, mientras que las perennes viven muchos años y florecen repetidamente.
Los mecanismos que impulsan los ciclos de vida de las plantas perennes, incluida la floración estacional, son menos conocidos que los de las plantas anuales.
Arabidopsis thaliana es un modelo anual, mientras que su pariente Arabis alpina es perenne.

Objetivo del estudio:

Para investigar la base genética de la floración perenne en el Arabis alpina.
Para entender cómo las plantas perennes regulan los ciclos de floración repetidos sincronizados con las estaciones.
Para comparar los mecanismos de regulación de la floración entre las especies perennes y anuales.

Principales métodos:

Identificación y caracterización del mutante de floración perpetua 1 (pep1) en el Arabis alpina.
Análisis comparativo de la PEP1 en el Arabis alpina y el LOCUS FLOWERING C (FLC) en la Arabidopsis thaliana.
Examen de los patrones de expresión génica y las modificaciones de la cromatina.

Principales resultados:

El mutante pep1 exhibe características perennes alteradas, incluida la duración de la floración y la ramificación.
PEP1 es el ortólogo de Arabidopsis FLC, regulando las respuestas estacionales de floración.
PEP1 exhibe una represión transitoria por el frío, lo que permite la floración cíclica, a diferencia de la represión estable de FLC.
Distintos patrones de modificación de la cromatina se correlacionan con la expresión diferencial de PEP1 y FLC.

Conclusiones:

PEP1 es un regulador clave de los rasgos de la historia de vida de las plantas perennes, incluida la floración estacional.
Las diferencias en la regulación de la cromatina de PEP1 y FLC explican las variaciones en el control de la floración entre las especies perennes y anuales.
Este estudio revela un mecanismo crítico que subyace a la evolución de los ciclos de vida de las plantas perennes.

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