Abstract
CONIFERS have not been very responsive to treatment with gibberellic acid. A definite stimulation of extension growth was obtained by Marth et al. 1 in only two of the five species investigated, Pinus virginiana Mill., and Juniperus chinensis f. Pfitzeriana Spaeth. Measurable, but not significant, increases in height growth of treated Pinus strobus L. have been reported2. Radicles of germinating seeds of Pseudotsuga menziesii (Mirb.) Franco elongated more rapidly if wetted with weak solutions of gibberellic acid3.
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References
Marth, P. C., Audia, W. V., and Mitchell, J. W., Bot. Gaz., 118, 106 (1956).
Nelson, T. C., J. Forestry, 55, 518 (1957).
Richardson, S. D., Nature, 181, 429 (1958).
Lockhart, J. A., and Bonner, J., Plant Physiol., 32, 492 (1957).
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BOURDEAU, P. Interaction of Gibberellic Acid and Photo-period on the Vegetative Growth of Pinus elliottii . Nature 182, 118 (1958). https://doi.org/10.1038/182118a0
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DOI: https://doi.org/10.1038/182118a0
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