Flavin-Mediated Weak-Light Chloroplast Movement in Mougeotia

  • T. Walczak
  • H. Gabrys
  • W. Haupt
Part of the Proceedings in Life Sciences book series (LIFE SCIENCES)


In Mougeotia the two types of chloroplast movement depend in a different way on the wavelength of the orienting light: The high-fluence-rate response (face-to-profile orientation) can be induced exclusively by blue light, and this is an effect of an interaction of phytochrome and a blue-light-absorbing pigment (cf. [10]). In contrast, the low- fluence-rate response (profile-to-face orientation) has its maximum in red light with a typical red/far-red reversibility; thus, phytochrome has been accepted as the main photoreceptor pigment involved ([4], cf. also [5]). There was, however, some controversy, whether or not the lower effect of the blue light region could be explained on the basis of phytochrome alone (e.g. [3], cf. also [5]). Only recently a strong argument in favor of a separate blue-light photoreceptor pigment has been derived from a new experimental approach [2]. These results will be summarized briefly, and additional experiments will be reported.


Blue Light Action Spectrum Fluence Rate Chloroplast Movement Transmission Change 
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Copyright information

© Springer-Verlag Berlin Heidelberg 1984

Authors and Affiliations

  • T. Walczak
    • 1
  • H. Gabrys
    • 2
  • W. Haupt
    • 3
  1. 1.Institute of Nuclear PhysicsKrakówPoland
  2. 2.Institute of Molecular BiologyJagiellonian UniversityKrakówPoland
  3. 3.Institut für Botanik und Pharmazeutische Biologieder Universität Erlangen-NürnbergErlangenGermany

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