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AUXIN BIOSYNTHESIS.

Bonnie Bartel1

  • 1Department of Biochemistry and Cell Biology, Rice University, Houston, Texas 77005.

Annual Review of Plant Physiology and Plant Molecular Biology
|June 1, 1997
PubMed
Summary
This summary is machine-generated.

Plants synthesize the crucial hormone indole-3-acetic acid (IAA) through complex, multiple pathways. Recent genetic and biochemical studies are beginning to clarify these intricate routes of plant hormone biosynthesis.

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Area of Science:

  • Plant Biology
  • Biochemistry
  • Genetics

Background:

  • Indole-3-acetic acid (IAA) is the primary naturally occurring auxin in plants.
  • Plants synthesize active IAA via de novo pathways and by cleaving IAA conjugates.
  • The exact pathways for IAA biosynthesis remain incompletely understood.

Purpose of the Study:

  • To review recent genetic and biochemical findings on plant IAA biosynthesis.
  • To elucidate the complex mechanisms controlling IAA levels in plants.
  • To highlight the multiplicity of IAA synthesis and metabolism pathways.

Main Methods:

  • Review of recent genetic experiments.
  • Complementary biochemical analyses.
  • Application of precise IAA and metabolite quantitation methods to plant mutants.

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Main Results:

  • Multiple pathways exist for de novo IAA synthesis.
  • Various plant enzymes can release IAA from conjugates.
  • Both tryptophan-dependent and tryptophan-independent routes of IAA biosynthesis have been identified.
  • Studies on plant mutants are beginning to clarify IAA regulatory pathways.

Conclusions:

  • Plant IAA biosynthesis is complex, involving multiple de novo and conjugate-releasing pathways.
  • No single pathway of IAA biosynthesis has been unequivocally established.
  • Ongoing genetic and biochemical research is crucial for fully understanding plant auxin regulation.