On the question of ?-indolyl-acetic acid synthesis from indole without a tryptophan intermediate

1 January 1976

journal article
research article
Published by Springer Nature in Planta

Vol. 131 (3) , 299-302
https://doi.org/10.1007/bf00385430

Abstract

Experiments with sterile grown maize coleoptiles were carried out to decide whether or not a biosynthetic path for β-indolyl-acetic acid (IAA) from indole exists without tryptophan occurring as an intermediate. β-Indolyl-acrylic acid as a tryptophan synthetase inhibitor significantly reduces the yield of [³H]tryptophan obtained from [³H]indole while the reduction in the [³H]IAA yield is considerably less pronounced. This, however, indicates only a non-linear relationship between the tryptophan concentration and the IAA yield and not the sought path. Moreover, double labelling combined with isotope competition methods in experiments with [³H]indole and L-[¹⁴C]serin show that all IAA synthesized from [³H]indole is produced on a path involving the synthesis of tryptophan as an intermediate.

Keywords

This publication has 5 references indexed in Scilit:

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