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The transition from spiral to distichous leaf arrangement during gibberellic-acid (GA3)-induced rejuvenation in Hedera was studied in detail by scanning electron microscopy of the shoot apical meristem. The transition, which involves the initiation of about 14 new leaf primordia, is accomplished by progressive increments in the divergence angle between the(More)
The changes in the pattern of cell arrangement and surface topography at the shoot apical meristem of Hedera helix L., which occur during gibberellic acid (GA3)-induced transition from spiral to distichous phyllotaxis, were examined by scanning electron microscopy of rapidly frozen tissue. The technique preserves the original shape of the cells in their(More)
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