Thiocarbamates as plant growth regulators

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Abstract
Among 7 ethyl esthyl esters of N-substituted carboxymethyl dithiocarbamates only the dimethyl and diethyl derivatives were active in promoting elongation of Avena coleoptile tissue. 2-Propanol at 0.5% required to dissolve the ethyl esters was found to repress the intrinsic elongation of the tissue as well as that induced by indole-3-acetic acid (IAA). Thus less growth is obtained with the ethyl ester of carboxymethyl dimethyldithiocarbamate than with the acid at high concentrations, but at 5 x 10-6 [image] the ester has an effect while the acid has none. Substitution of 2 butyl groups or methyl and phenyl groups on the N atom results in compounds with strong inhibitory action on elongation. Inhibition also occurs with hexanyl substitution or incorporation of the N atom into piperidine or morpholine rings. The interaction of the dimethyldithiocarbamate and ethoxycarbonylmethyl N-methyldithiocarbanilate with IAA suggests that these substances have at least 1 reaction site in common, that reacting with the carboxyl group. It also is probable that a reaction of the electron-rich N atom is involved.

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