Indole-3-acetic acid biosynthesis in the mutant maize orange pericarp, a tryptophan auxotroph

Allen D. Wright, Michael B. Sampson, M. Gerald Neuffer, Lech Michalczuk, Janet Pernise Slovin, Jerry D. Cohen

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148 Scopus citations

Abstract

The maize mutant orange pericarp is a tryptophan auxotroph, which results from mutation of two unlinked loci of tryptophan synthase B. This mutant was used to test the hypothesis that tryptophan is the precursor to the plant hormone indole-3-acetic acid (IAA). Total IAA in aseptically grown mutant seedlings was 50 times greater than in normal seedlings. In mutant seedlings grown on media containing stable isotope-labeled precursors, IA was more enriched than was tryptophan. No incorporation of label into IAA from tryptophan could be detected. These results establish that IAA can be produced de novo without tryptophan as an intermediate.

Original languageEnglish (US)
Pages (from-to)998-1000
Number of pages3
JournalScience
Volume254
Issue number5034
DOIs
StatePublished - Jan 1 1991

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