The auxins, IAA and PAA, are synthesized by similar steps catalyzed by different enzymes

One of the fundamental plant growth substances, indole-3-acetic acid (IAA), belongs to a class of phytohormones known as auxins. The main IAA biosynthesis pathway involves the conversion of tryptophan to indole-3-pyruvic acid, which is in turn converted to IAA. The two enzymes responsible for these...

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Bibliographic Details
Published in:Plant signaling & behavior 2016-11, Vol.11 (11), p.e1250993-e1250993
Main Authors: Cook, Sam D., Ross, John J.
Format: Article
Language:English
Subjects:
amino acid
Aminotransferase
Arabidopsis - metabolism
Arabidopsis Proteins - metabolism
biosynthesis
Gene Expression Regulation, Plant
Indoleacetic Acids - metabolism
metabolism
Phenylacetates - metabolism
phytohormone
Plant Growth Regulators - metabolism
Short Communication
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Summary:One of the fundamental plant growth substances, indole-3-acetic acid (IAA), belongs to a class of phytohormones known as auxins. The main IAA biosynthesis pathway involves the conversion of tryptophan to indole-3-pyruvic acid, which is in turn converted to IAA. The two enzymes responsible for these conversions, members of the TAA1 and YUCCA gene families, respectively, have recently been implicated in the synthesis of another auxin, phenylacetic acid (PAA). While there is some evidence to support this theory, there are also some concerns. Here we address the question: to what extent does the TAA1/YUCCA system contribute to the biosynthesis of PAA? In addition, we highlight the importance of measuring auxin metabolites and conjugates in addressing such questions.
ISSN:1559-2316
1559-2324
1559-2324
DOI:10.1080/15592324.2016.1250993