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Regulation of Hormone Secretion
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Predicción de los reguladores fotoperiódicos a partir de modelos cuantitativos de circuitos genéticos
José Domingo Salazar1, Treenut Saithong, Paul E Brown
1Department of Biological Sciences, University of Warwick, Coventry CV4 7AL, UK.
Cell
|December 17, 2009
Resumen
Las plantas usan sensores fotoperiódicos para adaptarse a las estaciones. Este estudio revela que FLAVIN, KELCH, F-BOX (FKF1) activa directamente el LOCUS T (FT) de floración, un nuevo controlador del tiempo de floración de las plantas.
Área de la Ciencia:
- Biología vegetal Biología vegetal
- Genética molecular genética molecular.
- Cronobiología cronobiología.
Sus antecedentes:
- Las plantas se adaptan a los cambios estacionales a través de la detección del fotoperíodo, principalmente se supone que implica el acoplamiento de ritmos internos con señales de luz externas.
- Las proteínas CONSTANS (CO) y FLAVIN, KELCH, F-BOX (FKF1) en Arabidopsis se proponen como componentes clave de un sensor de coincidencia externo para el fotoperiodismo.
Objetivo del estudio:
- Para modelar la integración de la luz y la información de sincronización por el reloj circadiano, CO, y su gen diana FLOWERING LOCUS T (FT).
- Identificar nuevos mecanismos moleculares que controlan el fotoperiodismo y el tiempo de floración en las plantas.
Principales métodos:
- Modelado computacional de redes de genes que integran la luz y las señales del reloj circadiano.
- Validación experimental de las interacciones genéticas predichas, específicamente el papel de FKF1 en la regulación de FT.
Principales resultados:
- El modelado predijo que FKF1 activa directamente a FT.
- Los resultados experimentales confirmaron que FKF1 activa FT independientemente del CO, identificando una nueva vía reguladora.
- Esto pone de relieve la complejidad del mecanismo del sensor fotoperiódico.
Conclusiones:
- FKF1 es un nuevo controlador importante del fotoperiodismo, que actúa directamente sobre el FT.
- Comprender este complejo mecanismo de detección del fotoperiodo puede contribuir a la mejora de los cultivos y la mejora del rendimiento.
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