Memorias de investigación
Artículos en revistas:
Flavonols Mediate Root Phototropism and Growth through Regulation of Proliferation-to-Differentiation Transition
Año:2016
Áreas de investigación
  • Biología molecular, celular y genética
Datos
Descripción
Roots normally grow in darkness, but they may be exposed to light. After perceiving light, roots bend to escape from light (root light avoidance) and reduce their growth. How root light avoidance responses are regulated is not well understood. Here, we show that illumination induces the accumulation of flavonols in Arabidopsis thaliana roots. During root illumination, flavonols rapidly accumulate at the side closer to light in the transition zone. This accumulation promotes asymmetrical cell elongation and causes differential growth between the two sides, leading to root bending. Furthermore, roots illuminated for a long period of time accumulate high levels of flavonols. This high flavonol content decreases both auxin signaling and PLETHORA gradient as well as superoxide radical content, resulting in reduction of cell proliferation. In addition, cytokinin and hydrogen peroxide, which promote root differentiation, induce flavonol accumulation in the root transition zone. As an outcome of prolonged light exposure and flavonol accumulation, root growth is reduced and a different root developmental zonation is established. Finally, we observed that these differentiation-related pathways are required for root light avoidance. We propose that flavonols function as positional signals, integrating hormonal and reactive oxygen species pathways to regulate root growth direction and rate in response to light.
Internacional
Si
JCR del ISI
Si
Título de la revista
Plant Cell
ISSN
1040-4651
Factor de impacto JCR
9,338
Información de impacto
Datos JCR del año 2014
Volumen
28
DOI
10.?1105/?tpc.?15.?00857
Número de revista
6
Desde la página
1372
Hasta la página
1387
Mes
JUNIO
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Participantes
Grupos de investigación, Departamentos, Centros e Institutos de I+D+i relacionados
  • Creador: Grupo de Investigación: Biotecnología Vegetal
  • Grupo de Investigación: Redes Reguladoras del Desarrollo y Respuesta a Estrés en Plantas