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Plant Physiol. 2012 Jul;159(3):1055-63. doi: 10.1104/pp.112.198457. Epub 2012 May 9.

Biosynthesis of the halogenated auxin, 4-chloroindole-3-acetic acid.

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1
School of Plant Science , University of Tasmania, Sandy Bay, Tasmania, Australia 7005.

Abstract

Seeds of several agriculturally important legumes are rich sources of the only halogenated plant hormone, 4-chloroindole-3-acetic acid. However, the biosynthesis of this auxin is poorly understood. Here, we show that in pea (Pisum sativum) seeds, 4-chloroindole-3-acetic acid is synthesized via the novel intermediate 4-chloroindole-3-pyruvic acid, which is produced from 4-chlorotryptophan by two aminotransferases, TRYPTOPHAN AMINOTRANSFERASE RELATED1 and TRYPTOPHAN AMINOTRANSFERASE RELATED2. We characterize a tar2 mutant, obtained by Targeting Induced Local Lesions in Genomes, the seeds of which contain dramatically reduced 4-chloroindole-3-acetic acid levels as they mature. We also show that the widespread auxin, indole-3-acetic acid, is synthesized by a parallel pathway in pea.

PMID:
22573801
PMCID:
PMC3387693
DOI:
10.1104/pp.112.198457
[Indexed for MEDLINE]
Free PMC Article
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