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Detection of Histone Modifications in Plant Leaves
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CHL1 funciona como un sensor de nitrato en las plantas.

Cheng-Hsun Ho1, Shan-Hua Lin, Heng-Cheng Hu

  • 1Molecular Cell Biology, Institute of Molecular Biology, Academia Sinica, and Taipei, Taiwan.

Cell
|September 22, 2009
PubMed
Resumen

Las plantas detectan los niveles de nitrato en el suelo mediante el transportador CHL1, que actúa como un sensor de iones de doble afinidad. La fosforilación por CIPK23 regula el CHL1.

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Área de la Ciencia:

  • Biología Vegetal Biología Vegetal
  • Fisiología Molecular de las Plantas Fisiología Molecular.
  • El transporte es un ion de transporte.

Sus antecedentes:

  • Los iones son nutrientes vitales y moléculas de señalización en las plantas.
  • Los mecanismos de detección de plantas para las variaciones de nutrientes del suelo no se comprenden completamente.
  • El transportador CHL1 exhibe características de doble afinidad basadas en el estado de fosforilación T101.

Objetivo del estudio:

  • Para investigar el papel del transportador de nitrato CHL1 como un sensor de nitrato en las plantas.
  • Para dilucidar el mecanismo por el cual CHL1 detecta diferentes concentraciones de nitrato.
  • Comprender la función de la fosforilación de CHL1 en las respuestas de nitrato primario.

Principales métodos:

  • Análisis de mutantes CHL1 desacoplados por absorción y detección.
  • Estudio de plantas transgénicas CHL1T101D y CHLT101A.
  • Pruebas bioquímicas in vitro e in vivo. ensayos bioquímicos in vitro y in vivo. ensayos bioquímicos in vitro y in vivo. ensayos bioquímicos in vitro y in vivo. ensayos bioquímicos in vivo. ensayos bioquímicos in vitro y in vivo. ensayos bioquímicos in vivo.
  • Investigación de la actividad de la proteína quinasa CIPK23 en CHL1.1.

Principales resultados:

  • CHL1 funciona como un sensor de nitrato, independiente de su actividad de transporte.
  • La CHL1 fosforilada media una respuesta primaria de nitrato de bajo nivel, mientras que la CHL1 desfosforilada media una respuesta de alto nivel.
  • CIPK23 fosforila CHL1 en T101, contribuyendo a la detección de bajos niveles de nitrato y al mantenimiento de la respuesta.

Conclusiones:

  • CHL1 funciona como un sensor de iones de doble afinidad en las plantas superiores.
  • Un mecanismo de interruptor de fosforilación permite a CHL1 detectar una amplia gama de concentraciones de nitrato en el suelo.
  • CHL1 integra las vías de detección y señalización de nutrientes en las plantas.