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


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Tivendale, ND, Davidson, SE, Davies, NW, Smith, JA, Dalmais, M, Bendahmane, AI, Quittenden, LJ, Sutton, L, Bala, RK, Le Signor, C, Thompson, R, Thorne, J, Reid, JB and Ross, JJ 2012 , 'Biosynthesis of the halogenated auxin, 4-chloroindole-3-acetic acid' , Plant Physiology, vol. 159, no. 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
Authors/Creators: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
Journal or Publication Title: Plant Physiology
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Copyright 2012 American Society of Plant Biologists

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