Growth regulators in the rooting of sun poinsettia (Euphorbia pulcherrima Willd. ex Klotzsch, Allg. Gartenzeitung) Valenciana variety

Objective: To improve the asexual propagation of the sun poinsettia (Euphorbia pulcherrima) Valenciana variety using growth regulators and monitoring the position of the buds on the stem.Methodology: We compared root length, shoot length, and the number of roots, shoots, and leaves between control plants and plants with five different concentrations of three growth regulators (indole butyric acid, naphthaleneacetic acid, and gibberellic acid). We also evaluated the effect of the position of the axillary or vegetative buds on the stem on the same parameters. The data were analyzed by analysis of variance and multiple comparisons of means.Results: The treatments with the highest root length, shoot length, and number of roots, nodes, and leaves were 2 A (AIB 200 mg L1, basal part), 3 A (AIB 300 mg L1, basal part), and 3 B (AIB mg L1, intermediate part).Implications: This work helps solve a technical issue of sun poinsettia production in Mexico.Conclusions: The application of indolbutyric acid at concentrations of 200 mg L1 and 300 mg L1 in stem cuttings of the intermediate and base promotes increased root and aerial development.