Abstract
A plant growth regulator 2-methyl 4-chlorophenoxy acetic acid “MCPA” is interacted with a range of surface-active compounds, spread as monolayers on a Langmuir trough, to investigate factors involved in its mode of action within the plant. By using quaternary ammonium salt C 18H 37N +(CH 3) 3}Cl −, it is deduced that “MCPA” interacts in the ionic form above pH 4.0. It also interacts in low concentration with long-chain amines and ketones. Estimations of the adsorption of “MCPA” to monolayers of a protein, lipoid, lipoprotein and finally to monolayers produced directly from plant tissuee, lend support to the suggestion that the foundation of species susceptibility may be based upon the extent of its adsorption to sites not concerned in the physiological response.
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