Phase Change inHedera helixL.

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Abstract
Gibberellic acid, applied to delaminated petioles of rooted cuttings of juvenile and adult ivy initially induced internode elongation and abnormal leaf development, and suppressed apical dominance. Juvenile cuttings were affected only transiently and soon reverted to normal growth. Adult cuttings, instead of resuming normal growth after this initial response to GA3, gradually developed many juvenile characteristics. Approximately 16 weeks after treatment at 25 °C nearly all shoots of adult cuttings had undergone complete rejuvenation. Lower temperature reduced the speed of response to GA3. A mixture of gibberellins A4 and A7 had effects similar to those of GA3 on the growth of juvenile and adult cuttings. Treatment of both phases of ivy with abscisic acid (ABA) induced no visible effects and when ABA was applied with GA3 it did not reduce the response of either phase to the gibberellin. CCC had a marked dwarfing effect on juvenile ivy but did not induce pre-maturation. However, extraction of gibberellin-like substances from severely dwarfed plants suggested that CCC was not exerting its growth retarding effect through an inhibition of gibberellin biosynthesis. AMO 1618 did not retard growth of juvenile ivy cuttings.

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