Propagation and application of paclobutrazol for the production of Muang-Triboun as pot plant

Abstract

Muang-Triboun (Tribounia venosa (Barnett) D.J. Middleton) is an endemic species. This Tribounia species found on karst limestone, habitat in Suphan Buri province. Flower morphology is inflorescence flower, each flower being comprised of dark purple florets. Development of Muang-Triboun as new flowering potted plants. However, there are 30-40 cm plant high in nature and less information about plant propagation. The objectives of this study were to propagate by cutting technique, and to analyze the effect of paclobutrazol (PBZ) on the growth of Muang-Triboun. Plant propagation by shoot, leaf and node cutting was combined with different concentration of NAA solution at 0 (water is control), 50, 100, 150 and 200 mg/l. The result showed that the concentrations of NAA solution and explants cutting were not significantly influenced (P > 0.05). Shoot immersed in all concentrations of NAA gave the highest percentage root formation, and also leaf cutting with NAA solution at 150 mg/l gave the percentage root formation at 100%. The plantlets from shoot and leaf cuttings were transfer into pot plant, and it was showed that plantlet from shoot cutting gave survival rate (79.11+19.76%). The effect of PBZ concentrations (50, 100, 150, 200 mg/l), 50 mg/tree, on growth of Muang-Triboun was investigated. It was found that all concentrations of PBZ solution gave statistically significant (P < 0.05) in plant height, canopy size, node length, leaf width, and leaf length. The PBZ solution at 200 mg/l gave the lowest plant height, canopy width, node length, leaf width and leaf length. However, this concentration gave the highest number of branches.