Effect of Peroxydisulfate onVigna radiataAbscission

摘要

K2S2O8, applied to the basal end of cuttings ofVigna radiatastimulated leaf abscission in the light or dark. Because inhibition of leaf sbscission in the dark by IAA was completely abolished by K2S2O8, and IAA decreased stimulation of abscission by K2S2O8, destruction of IAA in the cuttings by K2S2O8is indicated. K2S2O8had no effect on leaf abscission when applied as a foliar spray or when roots of undisturbed seedlings were treated. When applied proximally or distally to leafless explants, K2S2O8inhibited petiole abscission, and neither IAA nor ethylene had an effect on the inhibition. Although K2S2O8destroyed IAA in vitro, it had no effect on abscission inhibitors in macerates ofVignaleaves and corn roots, nor did it destroy the biological activity of IAA added to such macerates. Substances liberated by maceration may interfere with the ability of K2S2O8to destroy IAA.