Auxin activity of 3-menthyleneoxindole in wheat

Auxin activity of 3-menthyleneoxindole in wheat

A product of the enzymatic oxidation of indole-3-acetic acid, 3-methyleneoxindole, is at least 50-fold more effective than indole-3-acetic acid in stimulating the growth of wheat (Triticum vulgare, red variety) coleoptiles. Ethylenediaminetetraacetic acid can antagonize the growth-stimulating proper...

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Veröffentlicht in:Plant physiology (Bethesda) 1972-01, Vol.50 (4), p.499-502
Hauptverfasser: Basu, P.S, Tuli, V
Format: Artikel
Sprache:eng
Schlagworte:
Auxins
Coleoptiles
Dehydration
field crops
Oxidation
plant biochemistry
plant physiology
Plants
Reagents
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Tuli, V
description A product of the enzymatic oxidation of indole-3-acetic acid, 3-methyleneoxindole, is at least 50-fold more effective than indole-3-acetic acid in stimulating the growth of wheat (Triticum vulgare, red variety) coleoptiles. Ethylenediaminetetraacetic acid can antagonize the growth-stimulating properties of the parent compound, indole-3-acetic acid, presumably by chelating Mn2+, which is required for the enzymatic oxidation of indole-3-acetic acid. The growth stimulating effect of 3-methyleneoxindole, a product of the blocked reaction, on the other hand, is still evident in the presence of ethylenediaminetetraacetic acid. In the presence of 2-mercaptoethanol, indole-3-acetic acid fails to stimulate the elongation of wheat coleoptiles. The property of binding to sulfhydryl compounds including 2-mercaptoethanol is unique to 3-methyleneoxindole among indole-3-acetic acid and its oxidation products. These findings suggest that 3-methyleneoxindole is an obligatory intermediate in indole-3-acetic acid induced elongation of wheat coleoptiles.
doi_str_mv 10.1104/pp.50.4.499
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Ethylenediaminetetraacetic acid can antagonize the growth-stimulating properties of the parent compound, indole-3-acetic acid, presumably by chelating Mn2+, which is required for the enzymatic oxidation of indole-3-acetic acid. The growth stimulating effect of 3-methyleneoxindole, a product of the blocked reaction, on the other hand, is still evident in the presence of ethylenediaminetetraacetic acid. In the presence of 2-mercaptoethanol, indole-3-acetic acid fails to stimulate the elongation of wheat coleoptiles. The property of binding to sulfhydryl compounds including 2-mercaptoethanol is unique to 3-methyleneoxindole among indole-3-acetic acid and its oxidation products. 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subjects Auxins
Coleoptiles
Dehydration
field crops
Oxidation
plant biochemistry
plant physiology
Plants
Reagents
title Auxin activity of 3-menthyleneoxindole in wheat
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