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

摘要: 1. The purposes of this investigation were to obtain quantitative data on the photoreactions that prevent flowering short-day plants, from which an action spectrum relating wave length photoperiodic effectiveness light could be derived, and draw such inferences concerning nature as would permit. 2. Experiments designed give made use a specially prism spectrograph having dispersion 15 A. per cm. at 5000 At with effective slit width 100 energy was about 3000 ergs sq. second illuminated by carbon arc operated 12 kw. input. 3. Plants investigated soybean, Soja max (L.) Piper var. Biloxi, cocklebur, Xanthium saccharatum Wallr. To facilitate irradiation, foliar surface plants each species beginning experiment reduced single leaflet or leaf, respectively. 4. experimental treatment based fac...