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Effects of Gibberellic Acid on Juvenility in Marsilea and certain other Plants


IN addition to the more familiar effects of gibberellic acid, it has recently been found, by several authors, that this substance can affect the duration of the juvenile stages of certain plants. Thus, Robbins1, discovered that when an arborescent form if ivy (Hedera canariensis variegata var. arborescens) was supplied with gibbereliic acid, branches with completely juvenile characteristics were produced by some of the treated plants. Robbins believed that gibbereliic acid is probably comparable with the ‘Jugendsubstanz’ postulated by Frank and Renner2 in explanation of their own observations, and earlier work by Doorenbos3 on the rejuvenation of adult ivy shoots. Scurfield and Moore4, however, found that seedlings of Eucalyptus species, when treated with gibbereliic acid, developed the adult leaf type earlier than the control plants, although Njoku5, using seedlings of Ipomoea caerulea, obtained a prolongation of the juvenile phase.

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  1. 1

    Robbins, W. J., Amer. J. Bot., 44, 743 (1957).

  2. 2

    Frank, H., and Renner, O., Planta, 47, 105 (1956).

  3. 3

    Doorenbos, J., Proc. kon. ned. Akad. Wet. C, 57, 99 (1954).

  4. 4

    Scurfield, G., and Moore, C. W. E., Nature, 181, 1276 (1958).

  5. 5

    Njoku, E., Nature, 182, 1097 (1958).

  6. 6

    Allsopp, A., Ann. Bot., N.S. 16, 165 (1952).

  7. 7

    Allsopp, A., Nature, 173, 1032 (1954).

  8. 8

    Allsopp, A., “Encyclopedia of Plant Physiology”, 15 (in the press).

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