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- W2764608911 abstract "Stem segments excised from light-grown Pisum sativum L. (cv. Little Marvel) plants elongated in the presence of indole-3-acetic acid and its precursors, except for L-tryptophan, which required the addition of gibberellin A, for induction of growth. Segment elongation was promoted by D-tryptophan without a requirement for gibberellin, and growth in the presence of both D-tryptophan and L-tryptophan with gibberellin A3, was inhibited by the D-aminotransferase inhibitor D-cycloserine. Tryp-tophan racemase activity was detected in apices and promoted conversion of L-tryptophan to the D isomer; this activity was enhanced by gibberellin A3. When applied to apices of intact untreated plants, radiolabeled D-tryptophan was converted to indole-3-acetic acid and indoleacetylaspartic acid much more readily than L-tryptophan. Treatment of plants with gibberellin A3, 3 days prior to application of labeled tryptophan increased conversion of L-tryptophan to the free auxin and its conjugate by more than 3-fold, and led to labeling of N-malonyl-D-tryptophan. It is proposed that gibberellin increases the biosynthesis of indole-3-acetic acid by regulating the conversion of L-tryptophan to D-tryptophan, which is then converted to the auxin." @default.
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- W2764608911 date "1987-08-01" @default.
- W2764608911 modified "2023-10-18" @default.
- W2764608911 title "Gibberellin-enhanced indole-3-acetic acid biosynthesis: D-Tryptophan as the precursor of indole-3-acetic acid" @default.
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- W2764608911 doi "https://doi.org/10.1111/j.1399-3054.1987.tb04316.x" @default.
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