Phase Change inHedera helixL

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Abstract
When synthesis was estimated by the agar diffusion technique both basal and lateral adventitious roots of Hedera helix L. in the juvenile growth phase were shown to synthesize gibberellin-like substances. Seedlings and cuttings from juvenile ivy could be grown in water culture for several weeks. When roots were excised from these plants shoot growth was reduced in comparison with that of intact plants. The stems, apices, and leaves of derooted seedlings and cuttings contained lower levels of extractable gibberellin-like substances than comparable organs of intact plants. The major zone of gibberellin-like activity in intact plants co-chromatographed with gibberellins A1 and A3. When these gibberellins were applied to plants grown in culture they were found to promote growth of intact but not derooted plants. These findings are discussed in relation to the role of root factors and particularly gibberellins in phase change.

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