Studies on effect of auxin on rooting of stem cuttings of orange jasmine (Murraya paniculata)

The present study investigates the effect of various auxin treatments on the rooting and shooting behavior of semi-hardwood stem cuttings of Murraya paniculata (orange jasmine), a valuable ornamental shrub in landscaping and floriculture. Conducted at Kittur Rani Channamma College of Horticulture, Arabhavi, the experiment tested ten treatments comprising different concentrations of indole-3-butyric acid (IBA), naphthaleneacetic acid (NAA), and their combinations. Results indicated that the combination of IBA and NAA at 3000 ppm significantly enhanced propagation success. This treatment led to the earliest shoot (15.33 days) and root (28.33 days) initiation, longest shoot (10.33 cm) and root (7.90 cm) lengths, and the highest shoot number (4.33), root biomass, rooting percentage (85%), and survival rate (80%). These improvements are attributed to the synergistic effect of the auxins in promoting cell division, elongation, and nutrient uptake. The study concludes that the application of IBA+NAA at 3000 ppm is an effective and practical method for mass propagation of Murraya paniculata, facilitating its widespread adoption in ornamental horticulture.