Abstract: Effects of exogenous GA₃ , IBA as well as sawdust or peat as the medium on scale cutting propagation of lilium cv. 'Elite' were investigated with different culture methods. The result showed that scale cutting embedded in sawdust had the highest scale propagation coefficient and produced the most roots number, while scale cutting planted in sawdust produced larger bulblet and had more sprouted bulblets. In terms of plant growth regulator treatment, the species and treatment duration and the concentrations in order affected the scale propagation. IBA notably promoted the forming of bulblets and roots, and both of the organs developed simultaneously with IBA treatment. GA₃ favored the larger, well-formed bulblet development, however, the amount of bulblets and roots were less than that treated with IBA, and the roots initiated one week later after bulblets occurred. In addition, GA₃ significantly promoted the sprouting of bulblets at 18 ℃. The consumption process of storage substances in mother scales varied in different treatments. Scales of IBA treatment appeared rot on the bulblets after 60 d at 20 ℃, which suggested the scales should be transplanted timely to prevent from rotting, while GA₃ treatment could keep the scales healthy up to 80 d. Control also could achieve similar bulblets with GA₃ treatment, but longer culture time at the optimum temperature was needed.

Key words: Lilium cv. 'Elite', scale cutting, growth regulator, medium