Abstract
SINCE the isolation1 of gibberellin A (later identified2 as a mixture of gibberellins A 1, A 2 and A 3) and more recently the discovery3 of gibberellin A 4, numerous physiological responses have been induced in plants4 with the gibberellins. Takahashi et al. 2 reported that A 1, A 2 and A 3 all possessed strong physiological activities in stimulating the elongation of rice seedlings. Apart from this reference, the gibberellins have not been evaluated in terms of specific biological activities. The comparative effectiveness of gibberellins A 1, A 2, A 3 and A 4 and the methyl esters of A 1 and A 3 in promoting vegetative extension, flowering of facultative long-day annuals and in fruit setting is now reported5.
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References
Yabuta, T., and Sumiki, Y., J. Agric. Chem. Soc. Japan, 14, 1526 (1938).
Takahashi, N., Kitamura, H., Kawarada, A., Seta, Y., Takai, M., Tamura, S., and Sumiki, Y., Bull. Agric. Chem. Soc. Japan, 19, 267 (1955).
Takahashi, N., Seta, Y., Kitamura, H., and Sumiki, Y., Bull. Agric. Chem. Soc. Japan, 21, 396 (1957).
Stowe, B. B., and Yamaki, T., “Ann. Rev. Plant Physiol.”, 8, 181 (1957).
Journal Article No. 2231 from the Michigan Agricultural Experiment Station.
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BUKOVAC, M., WITTWER, S. Comparative Biological Effectiveness of the Gibberellins. Nature 181, 1484 (1958). https://doi.org/10.1038/1811484a0
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DOI: https://doi.org/10.1038/1811484a0
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