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


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Tivendale, ND and Davidson, SE and Davies, NW and Smith, JA and Dalmais, M and Bendahmane, AI and Quittenden, LJ and Sutton, L and Bala, RK and Le Signor, C and Thompson, R and Thorne, J and Reid, JB and Ross, JJ (2012) Biosynthesis of the halogenated auxin, 4-chloroindole-3-acetic acid. Plant Physiology, 159 (3). pp. 1055-1063.

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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 Pisum sativum (pea) 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, PsTAR1 and PsTAR2. We characterize a tar2 mutant, obtained by TILLING, 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.

Item Type: Article
Journal or Publication Title: Plant Physiology
Page Range: pp. 1055-1063
Additional Information: Copyright 2012 American Society of Plant Biologists
Date Deposited: 18 Jul 2012 04:48
Last Modified: 18 Nov 2014 04:39
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