Action Spectrum for the Photoperiodic Control of Floral Initiation of Short-Day Plants

@article{Parker1946ActionSF,
  title={Action Spectrum for the Photoperiodic Control of Floral Initiation of Short-Day Plants},
  author={Murl Wayne Parker and Sterling Brown Hendricks and H. A. Borthwick and Norbert J. Scully},
  journal={Botanical Gazette},
  year={1946},
  volume={108},
  pages={1 - 26}
}
1. The purposes of this investigation were to obtain quantitative data on the photoreactions that prevent flowering of short-day plants, from which an action spectrum relating wave length to photoperiodic effectiveness of light could be derived, and to draw such inferences concerning the nature of the photoreactions as the action spectrum would permit. 2. Experiments designed to give the action spectrum made use of a specially designed prism spectrograph having a dispersion of 15 A. per cm. at… Expand
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TLDR
It was shown that the red portion of the visible spectrum was especially effective in inducing photoperiodic responses in long day plants when used to prolong short winter days, and the infra-red was relatively ineffective under the conditions of experimentation. Expand
Photoperiodism in Relation to Hormones as Factors in Floral Initiation and Development
TLDR
Evidence is presented that the floral initiation substance is not identical with any of the following known plant growth factors: vitamins B1, B2, and B6, ascorbic acid, nicotinic Acid, pantothenic acid), theelin, theelol, inositol, or indoleacetic acid. Expand
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