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Linking photoreceptor excitation to changes in plant architecture

Academic Article
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Overview

authors

  • Li, L.
  • Ljung, K.
  • Breton, G.
  • Schmitz, R. J.
  • Pruneda-Paz, J.
  • Cowing-Zitron, C.
  • Cole, B. J.
  • Ivans, L. J.
  • Pedmale, U. V.
  • Jung, H. S.
  • Ecker, J. R.
  • Kay, Steve A.
  • Chory, Joanne

publication date

  • April 2012

journal

  • Genes & Development  Journal

abstract

  • Plants sense neighbor proximity as a decrease in the ratio of red to far-red light, which triggers a series of developmental responses. In Arabidopsis, phytochrome B (PHYB) is the major sensor of shade, but PHYB excitation has not been linked directly to a growth response. We show that the basic helix-loop-helix (bHLH) transcription factor PIF7 (phytochrome-interacting factor 7), an interactor of PHYB, accumulates in its dephosphorylated form in shade, allowing it to bind auxin biosynthetic genes and increase their expression. New auxin synthesized through a PIF7-regulated pathway is required for shade-induced growth, linking directly the perception of a light quality signal to a rapid growth response.

subject areas

  • Arabidopsis
  • Arabidopsis Proteins
  • DNA-Binding Proteins
  • Gene Expression
  • Gene Expression Regulation, Plant
  • Indoleacetic Acids
  • Light
  • Mutation
  • Phytochrome B
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Research

keywords

  • auxin
  • phytochrome
  • shade avoidance
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Identity

PubMed Central ID

  • PMC3337452

International Standard Serial Number (ISSN)

  • 0890-9369

Digital Object Identifier (DOI)

  • 10.1101/gad.187849.112

PubMed ID

  • 22508725
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Additional Document Info

start page

  • 785

end page

  • 790

volume

  • 26

issue

  • 8

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