Effects of Abscisic Acid and Ethephon on Rooting of Nodes of Mulberry Hardwood Stem Sections

Abstract

Abscisic acid (ABA) and ethephon at optimum concentrations (0, 1, 1 ppm) promoted rooting of preformed primordia of Morus alba L. cv. Minami-sakari hardwood stem sections (cuttings). At these same optimum concentrations, ethephon stimulated the onset of new shoot elongation, rooting and defoliation, whereas ABA delayed it. At 10 ppm, ABA depressed new shoot elongation and defoliation greatly and at 50 ppm, inhibited bud break completely. In contrast to this, 10 ppm ethephon only slightly depressed new shoot elongation but markedly stimulated defoliation. © 1987, Japan Society for Bioscience, Biotechnology, and Agrochemistry. All rights reserved.