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Investigating Tissue- and Organ-specific Phytochrome Responses using FACS-assisted Cell-type Specific Expression Profiling in Arabidopsis thaliana
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Light perception and signalling by phytochrome A.

J J Casal1, A N Candia2, R Sellaro2

  • 1IFEVA, Facultad de Agronomía, Universidad de Buenos Aires and CONICET, 1417 Buenos Aires, Argentina Fundación Instituto Leloir, Instituto de Investigaciones Bioquímicas de Buenos Aires-CONICET, C1405BWE Buenos Aires, Argentina casal@ifeva.edu.ar.

Journal of Experimental Botany
|November 14, 2013
PubMed
Summary
This summary is machine-generated.

Phytochrome A (phyA) and FAR-RED ELONGATED HYPOCOTYL1 (FHY1) mediate seedling de-etiolation. Sustained far-red light optimizes FHY1-phyA nuclear transport, reinforcing de-etiolation signaling pathways.

Keywords:
CONSTITUTIVE PHOTOMORPHOGENIC 1 (COP1)PHYTOCHROME INTERACTING FACTOR (PIF)high-irradiance response (HIR)nuclear translocationphytochromevery-low-fluence response (VLFR).

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Area of Science:

  • Plant biology
  • Photomorphogenesis
  • Molecular signaling

Background:

  • Phytochrome A (phyA) is crucial for seedling de-etiolation, mediating very-low-fluence responses (VLFRs) and high-irradiance responses (HIR).
  • FAR-RED ELONGATED HYPOCOTYL1 (FHY1) facilitates the nuclear transport of light-activated phyA.

Purpose of the Study:

  • To elucidate the role of FHY1 in phyA nuclear translocation and signaling under sustained far-red light.
  • To understand the molecular mechanisms underlying high-irradiance responses (HIR) in de-etiolation.

Main Methods:

  • Investigated phyA and FHY1 dynamics in etiolated seedlings under varying light conditions.
  • Analyzed downstream signaling components including CONSTITUTIVE PHOTOMORPHOGENIC 1 and PHYTOCHROME-INTERACTING FACTORs.
  • Examined the role of BELL-LIKE HOMEODOMAIN 1 in reinforcing photomorphogenesis.

Main Results:

  • Prolonged far-red light at high fluence rates maximizes FHY1-phyA complex cycling, enhancing nuclear phyA levels.
  • FHY1 facilitates phyA nuclear import and export, compensating for proteasomal degradation.
  • Nuclear phyA negatively regulates CONSTITUTIVE PHOTOMORPHOGENIC 1 and PHYTOCHROME-INTERACTING FACTORs, while FHY1 acts as a transcriptional co-activator.

Conclusions:

  • FHY1-mediated phyA nuclear transport is essential for efficient de-etiolation under sustained far-red light.
  • A positive feedback loop involving BELL-LIKE HOMEODOMAIN 1 reinforces HIR, promoting complete de-etiolation.