On the Mechanism of Action of Growth Regulators

descriptionPublicationkeyboard_double_arrow_right Article 01 Apr 1953 English Publisher:Oxford University Press (OUP)Journal:Plant Physiology, volume 28, pages 218-232 (issn: 0032-0889, eissn: 1532-2548,

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Authors: R M, Muir; C, Hansch;

doi: 10.1104/pp.28.2.218

pmid: 16654534

pmc: PMC540374

On the Mechanism of Action of Growth Regulators

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Abstract

Investigations of the effects of various analogues of indoleacetic acid, phenoxyacetic acid, phenylacetic acid and benzoic acid on the elongation of sections of Avena coleoptiles (7, 8, 16, 17) have led to the conclusion that plant growth-regulators react by a nucleophilic substitution at a position on the ring ortho to the carboxyl group or the side chain carrying this group and with the carboxyl group itself. The evidence at hand indicates tna? a cysteinyl unit of a protein is the most likely substrate for the two-point ortho reaction as illustrated below with 2,4-dichlorophenoxyacetic acid.

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