Journal Article

The Excessive Production of Indole-3-Acetic Acid and Its Significance in Studies of the Biosynthesis of This Regulator of Plant Growth and Development

Masayoshi Kawaguchi and Kunihiko Syōno

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 37, issue 8, pages 1043-1048
Published in print December 1996 | ISSN: 0032-0781
e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/oxfordjournals.pcp.a029051
The Excessive Production of Indole-3-Acetic Acid and Its Significance in Studies of the Biosynthesis of This Regulator of Plant Growth and Development

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  • Biochemistry
  • Molecular and Cell Biology
  • Plant Sciences and Forestry

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Because of the importance of indole-3-acetic acid (IAA) in the growth and development of plants, extensive studies of the biosynthesis of IAA have been performed during the four decades since the discovery of IAA as a plant hormone. The pathway for the biosynthesis of IAA in plants remains, however, to be unelucidated, even though studies within the past decade have revealed unexpected aspects of such biosynthesis. By contrast, two pathways to IAA have been characterized in bacteria at the molecular level: the indole-3-acetamide (IAM) pathway (L-tryptophan → IAM → IAA); the indole-3-pyruvic acid pathway (L-tryptophan → indole-3-pyruvic acid → indole-3-acetaldehyde → IAA) (Fig. 1). In both pathways, the details of the biosynthesis of IAA were clarified using IAA-over-producing bacteria. After a description of recent advances of the studies of the biosynthesis of IAA in plants, this review focuses on the excessive production of IAA in several organisms and its significance in the studies of the biosynthesis of IAA.

Keywords: Indole-3-acetamide (IAM) pathway; Indole-3-acetic acid (IAA); Indole-3-pyruvic acid pathway; Indolepyruvate decarboxylase

Journal Article.  0 words. 

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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