Abstract
THE cold requirement for flower formation in biennial Hyoscyamus niger was shown by Lang1 to be replaceable by application, of gibberellin, but no flowering response was observed at that time in either Petkus winter or spring rye similarly treated2. In 1958, I attempted to supplement partial vernalization in Petkus winter rye by a single injection of gibberellic acid (10 p.p.m.) through the third leaf. No effect on flower initiation was observed. Stem extension was unaffected in the unvernalized controls but considerably enhanced in the partially vernalized series. In 1959, further work was carried out to determine whether the lack of response was due to the low concentration of the single application of gibberellic acid, or whether stimulation of stem extension demanded some prior degree of flower initiation.
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References
Lang, A., Naturwiss., 43, 284 (1956).
Lang, A., Proc. U.S. Nat. Acad. Sci., 43, 709 (1957).
Gott, M. B., Gregory, F. G., and Purvis, O. N., Ann. Bot., N.S., 19, 87 (1955).
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PURVIS, O. Effect of Gibberellin on the Flower Initiation and Stem Extension in Petkus Winter Rye. Nature 185, 479 (1960). https://doi.org/10.1038/185479a0
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DOI: https://doi.org/10.1038/185479a0
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