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SummaryRooted cuttings of Dendranthema morifolium (Ramat.) Tzvelev (Chrysanthemum morifolium Ramat.) cvs Polaris and Bright Golden Anne were treated with the growth regulator 2-chloroethylphosphonic acid (ethephon) by applying a 10 μl drop containing 10 g l−1 a.i. to either a leaf or the apical bud, or both, or to different locations on the stem. Plants were either defoliated throughout the experiment, except for the treated (or control) leaf, or none of the leaves were removed. Plants were grown under short days and the effects of treatment assessed approximately four weeks later. Irrespective of the site of application, a single drop of ethephon increased leaf number, delayed time of flower initiation, reduced stem elongation and reduced apical dominance. The effect of ethephon was generally greater when the application site was closer to the apical bud rather than to a leaf. Application to the stem close to the apex was more effective than application to the base. Defoliating plants to one leaf resulte... |
