Effect of Ethephon on Suckering of Excised Roots and Rooting of Cuttings in Trembling Aspen

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The effect of ethylene on adventitious shoot and root development in aspen (Populus tremuloides Michx.) was determined using ethephon, an ethylene-releasing agent. At the lowest concentration employed, 100 mg/liter, ethephon promoted development of shoots from preexisting primordia on root segments, but increasing concentrations were inhibitory until at 1,600 mg/liter less than 1 percent developed shoots. Ethephon did not stimulate rooting of dormant stem cuttings; however, it had significant effects on bud break, shoot abscission, callus formation, and occurrence of decay. The rate of bud break (percentage of cuttings with buds breaking per unit time) was increased but the total number of buds leafing out was reduced relative to controls. After bud break, ethephon stimulated abscission of developing shoots. Ethephon inhibited decay in the stem cuttings and impeded formation of callus at their cut ends. Forest Sci. 24:66-72.

Keywords: Ethylene; Populus tremuloides; abscission; adventitious shoots; callus formation; fungicide

Document Type: Journal Article

Affiliations: Biological Technician, Intermountain Forest and Range Experiment Station, Forest Service, U.S. Department of Agriculture, Ogden, Utah 84401, located at the Intermountain Station's Forestry Sciences Laboratory, Logan, Utah.

Publication date: March 1, 1978

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