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Plant and Cell Physiology, 1996, Vol. 37, No. 8 1043-1048
© 1996

Mini Review

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 Syono

Department of Life Sciences, Graduate School of Arts and Sciences, University of Tokyo 3-8-1 Komaba, Meguro-ku, Tokyo, 153 Japan

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.

(Received June 24, 1996; Accepted September 25, 1996)
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