Abstract
N-Ethylmaleimide causes a rapid efflux of K+ from suspension-cultured cells of R. damascena. This efflux shows many characteristics of the UV-induced efflux of K+, including the appearance of HCO3- together with the K+ and inhibition by respiratory inhibitors. Cysteine inhibits the UV-induced efflux of K+. UV induces K+ efflux through an alteration of sulfhydryl residues.