Biosynthesis of the halogenated auxin, 4-chloroindole-3-acetic acid - INRAE - Institut national de recherche pour l’agriculture, l’alimentation et l’environnement
Journal Articles Plant Physiology Year : 2012

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

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.

Dates and versions

hal-02645727 , version 1 (29-05-2020)

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Nathan D. Tivendale, Sandra E. Davidson, Noel W. Davies, Jason A. Smith, Marion M. Dalmais, et al.. Biosynthesis of the halogenated auxin, 4-chloroindole-3-acetic acid. Plant Physiology, 2012, 159 (3), pp.1055-1063. ⟨10.1104/pp.112.198457⟩. ⟨hal-02645727⟩
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