Plant Morphology: Its Control in Proserpinaca by Photoperiod, Temperature, and Gibberellic Acid

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Science  31 May 1963:
Vol. 140, Issue 3570, pp. 998-1000
DOI: 10.1126/science.140.3570.998


Growth forms controlled by the photoperiod are modified by temperature and gibberellic acid. Gibberellic acid changes leaf orientation and prostrate growth habit of the short-day plant to that typical of the long-day plant and modifies leaf shape in both types of plants. Low temperature resembles short days in its effect on leaf shape and stem orientation of long-day plants. Geotropic responses of the stem appear to be modified by photoperiod, temperature, and gibberellic acid.