Hormonal Control and Development - Research Article from Macmillan Science Library: Plant Sciences

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Hormonal Control and Development

Biosynthesis.

Auxin (indoleacetic acid, IAA) is synthesized from indoleglycerophosphate, the precursor to the amino acid tryptophan, and, in some plants, from tryptophan itself. GA1, the principal active gibberellin in most plants, is synthesized via the isoprenoid pathway, followed by a series of many other gibberellin intermediates. The level of GA1 is very tightly regulated. The genes for the enzymatic conversions have been isolated, and the transcription of these genes have been shown to be under both feedback and environmental control. Gregor Mendel's tallness gene encodes a step in the gibberellin biosynthesis pathway just before GA1. Cytokinins are synthesized by the attachment of an isopentenyl side chain to adenosine phosphate. The enzyme for this process, isopentenyl transferase, is the main regulating step in cytokinin biosynthesis, and its gene has been used in the genetic transformation of plants to enhance cytokinin levels. Abscisic acid...

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This section contains 1,638 words
(approx. 6 pages at 300 words per page)
Buy the Hormonal Control and Development Encyclopedia Article
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Macmillan Science Library: Plant Sciences
Hormonal Control and Development from Macmillan Science Library: Plant Sciences. Copyright © 2001-2006 by Macmillan Reference USA, an imprint of the Gale Group. All rights reserved.
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