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Rapid synthesis of auxin via a new tryptophan-dependent pathway is required for shade avoidance in plants

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Overview

authors

  • Tao, Yi
  • Ferrer, J. L.
  • Ljung, K.
  • Pojer, F.
  • Hong, F.
  • Long, J. A.
  • Li, L.
  • Moreno, J. E.
  • Bowman, M. E.
  • Ivans, L. J.
  • Cheng, Y.
  • Lim, J.
  • Zhao, Y.
  • Ballare, C. L.
  • Sandberg, G.
  • Noel, J. P.
  • Chory, Joanne

publication date

  • April 2008

journal

  • Cell  Journal

abstract

  • Plants grown at high densities perceive a decrease in the red to far-red (R:FR) ratio of incoming light, resulting from absorption of red light by canopy leaves and reflection of far-red light from neighboring plants. These changes in light quality trigger a series of responses known collectively as the shade avoidance syndrome. During shade avoidance, stems elongate at the expense of leaf and storage organ expansion, branching is inhibited, and flowering is accelerated. We identified several loci in Arabidopsis, mutations in which lead to plants defective in multiple shade avoidance responses. Here we describe TAA1, an aminotransferase, and show that TAA1 catalyzes the formation of indole-3-pyruvic acid (IPA) from L-tryptophan (L-Trp), the first step in a previously proposed, but uncharacterized, auxin biosynthetic pathway. This pathway is rapidly deployed to synthesize auxin at the high levels required to initiate the multiple changes in body plan associated with shade avoidance.

subject areas

  • Amino Acid Sequence
  • Arabidopsis
  • Biosynthetic Pathways
  • Darkness
  • Gene Expression Regulation, Plant
  • Indoleacetic Acids
  • Molecular Sequence Data
  • Plant Leaves
  • Sequence Alignment
  • Tryptophan
  • Tryptophan Transaminase
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Identity

PubMed Central ID

  • PMC2442466

International Standard Serial Number (ISSN)

  • 0092-8674

Digital Object Identifier (DOI)

  • 10.1016/j.cell.2008.01.049

PubMed ID

  • 18394996
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Additional Document Info

start page

  • 164

end page

  • 176

volume

  • 133

issue

  • 1

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