PJB-2026-75
EFFECTS OF PLANT GROWTH REGULATORS ON THE ADVENTITIOUS ROOTS INDUCTION IN MAGNOLIA GRANDIFLORA L. CUTTINGS
Nazish Gulshad
Abstract
Magnolia grandiflora L. is a widely used ornamental specie. However, its vegetative propagation is difficult due to non-viable seeds. For this purpose the field experiment was carried out at Centre of Plant Biodiversity, University of Peshawar to evaluate the effects of plant growth regulators on adventitious roots induction in Magnolia grandiflora L. cuttings. The experiment was conducted according to two factorial completely randomize design (CRD). Stem cuttings were treated by quick dip method with four plant growth regulators (PGRs) i.e., Indole-3-acetic acid (IAA), Indole-3-butyric acid (IBA), 1-Naphthalene acetic acid (NAA) and Gibberellic acid (GA3) at concentrations of 3000 ppm, 6000 ppm and 12000 ppm. Rooting response was assessed based on rooting percentage, number of roots/cutting, root length, root diameter, number of leaves/cutting and survival percentage after transplantation. Among the tested PGRs, IBA significantly improved rooting and other growth parameters. IAA showed comparable responses to IBA for some parameters, although the values were low. NAA, GA3 and control treatment (distal water) did not improve rooting ability. High concentration of auxin generally 12000 ppm performs best in many parameters but not significantly higher than 6000 ppm in some parameters. Magnolia grandiflora L. cuttings exhibits limited rooting and requires exogenous application of auxin for effective propagation. Based on rooting performance, IBA at 6000 ppm appears to be an effective treatment for the vegetative propagation of Magnolia grandiflora L. from stem cuttings.
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