, Volume 49, Issue 4, pp 389–405 | Cite as

Der Einfluss monochromatischer Strahlung auf das Längenwachstum des Hypocotyls und auf die Anthocyanbildung bei Keimlingen von Sinapis alba L. (=Brassica alba Boiss.)

  • Hans Mohr


  1. a)

    Some photoreactions influencing the early stages of the development of mustard seedlings (Brassica alba Boiss.=Sinapis alba L.) were studied, using monochromatic radiation (400–800 mμ) from a spectrograph.

  2. b)

    Anthocyanin formation is light-dependent in these seedlings and is controlled by two photoreactions. One of these photoreactions is governed by the well-known red-far-red-pigment system and is practically saturated after a very shor time of irradiation (low-energy reaction). The other photoreaction for anthocyanin formation is a high-energy reaction. Its action spectrum was determined. There was an action throughout the visible spectrum with peaks in the far-red region (about 710 mμ) and in the blue region.

  3. c)

    The action spectrum for the influence of radiation between 400 and 800 mμ was also determined for the lengthening of the hypocotyl. It is practically identical with the action spectrum for the high-energy reaction of anthocyanin formation. This photoreaction which essentially controls the lengthening, is also a high-energy reaction. These facts and results of additional experiments with colored fluorescent tubes indicate that the same pigment system absorbs the energy which controls formation of anthocyanin and lengthening of the hypocotyl. A significant effect of the reversible red-far-red-pigment system on the lengthening of the hypocotyl could not be obtained.

  4. d)

    The region of action indicates that the pigment that is involved in the high-energy reactions might be a copper-flavoprotein.



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Copyright information

© Springer-Verlag 1957

Authors and Affiliations

  • Hans Mohr
    • 1
    • 2
  1. 1.Agricultural Research Service, Plant Industry StationU.S. Department of AgricultureBeltsvilleU.S.A.
  2. 2.Botanisches Institut der UniversitätTübingen

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