Diffusible Rooting Substances in Woody Ornamentals1

Open Access
Publisher Website
Google Scholar
Abstract
Water soluble rooting substances were obtained from selected woody ornamentals by the centrifugal diffusion method from the cuttings, or by the water extraction method from the ground freeze-dried cuttings. Species used were Cotoneaster racemiflora soongorica, Euonymus fortunei carrierei, Ilex opaca, Lonicera maacki, Physocarpus amurensis, Symplocos paniculata, Taxus cuspidata, Viburnum burkwoodi, and V. opulus. The centrifugal diffusates from Cotoneaster racemiflora soongorica, Euonymus fortunei carrierei, and Symplocos paniculata promoted rooting of mung bean cuttings. Generally the centrifugal diffusates from all of the species studied contained 4 root-promoting fractions with Rf’s, in isopropanol:ammonia:water, of 0–0.1, 0.2–0.4, 0.6–0.8, and 0.8–1.0. All of these fractions promoted rooting of mung bean cuttings without added indole-3-acetic acid. The fraction at Rf 0-0.1 caused the strongest root promotion. Similar results were found in the water extract from the freeze-dried materials. The results strongly suggest that diffusible and water-soluble rooting substances commonly exist among many species of woody plants.

This publication has 0 references indexed in Scilit: