In vitro shoot of Friederick’s Dendrobium orchid at length of 2-3 cm consisted of 3-4 nodes
was excised and transferred to culture on MS medium supplemented with 3% sucrose, and four
concentrations of PBZ (0.025, 0.05, 0.075 and 0.1 mg/l). PBZ at concentration ranging from
0.025 to 0.075 mg/l promoted budbreak at all nodes at high percentage of 40 to 50 significant
difference to high concentration tested (0.1 mg/l). PBZ at 0.05 mg/l gave the highest
percentage of floral bud induction at 29% significantly difference to other concentrations.
Flowering obtained in all PBZ concentrations containing medium was normal in morphology.
The flowers were yellow in color with a diameter of 3-4 cm and consisted of three sepals, two
petals, one lip and male and female organ.