Abstract
Adult Hedera helix L. plants were caused to revert to the juvenile form by foliar application of gibberellic acid. Beginning at the time of application of gibberellin, stem cross-sections were cultured at weekly intervals from adults and juveniles, and determination was made of the precise time at which complete reversion had taken place by comparing cellular (callus) growth rates. A statistical analysis demonstrated no difference in rates beginning at time t = 3 weeks. This time was far short of the 10 weeks necessary to bring about a complete change in overall shoot morphology.
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