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. 1973 Aug;52(2):186-9.
doi: 10.1104/pp.52.2.186.

Inactivity of 3-methyleneoxindole as mediator of auxin action on cell elongation

M L Evans  1 , P M Ray
Affiliations

Inactivity of 3-methyleneoxindole as mediator of auxin action on cell elongation

M L Evans et al. Plant Physiol. 1973 Aug.

Abstract

The recently reported growth-promoting ability of 3-methyl-eneoxindole was examined in order to test the hypothesis that indole-3-acetic acid acts as a growth promoter only after oxidative conversion to 3-methyleneoxindole. Methyleneoxindole was synthesized from indole-3-acetic acid and N-bromosuccinimide, and its identity was confirmed by ultraviolet absorption, infrared absorption, mass spectrometry, and melting point. Methyleneoxindole was found to lack growth-promoting activity in coleoptile and pea (Pisum sativum) stem segments. Chlorogenic acid, an inhibitor of the oxidation of indole-3-acetic acid, was found to have no inhibitory effect on growth promotion by indole-3-acetic acid. It is concluded that 3-methyleneoxindole is inactive as a growth promoter and therefore does not mediate the action of auxin on cell elongation.

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References

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