Seasonal Changes in Leaf Emergence from Scale Bulblets during Scaling and Endogenous Plant Hormone Levels in Easter Lily (Lilium longiflorum Thunb.)

Leaf emergence from scale bulblets during scaling in Lilium longijlorum was investigated monthly throughout the year with respect to endogenous plant hormone levels to clarify the factors inducing dormancy of bulbs and the relationship between the induction of bulb formation and the induction of dormancy. Leaf emergence behavior suggested us that the bulbs of L. Longijorum were induced into dormancy by low winter temperature and released by high summer temperature. These were confirmed also by changes in abscisic acid and auxin activities in the bulbs. It was also suggested that there is a close relationship between the induction of bulb formation and the induction of dormancy of autumn planting bulbous plants including L. longiforum