Effect of Sulfhydryl Inhibitors on Rubidium Absorption by Excised Mung Bean Roots.

Abstract

The effect of sulfhydryl inhibitors on Rb absorption by excised mung bean roots (Phaseolus aureus) was investigated. Strong -SH inhibitors, such as Cu and phenylmercuric nitrate, at low concentrations markedly increased Rb uptake in the absence of Ca. Rb absorption in the presence of Ca, however, was greatly reduced by these inhibitors. Weaker -SH poisons showed less or none of these effects. The results are explained in terms of a hypothesis involving a ribonucleoprotein complex in ion absorption.