Blue Light Receptors in Phycomyces Investigated by Action Spectroscopy, Fluorescence Lifetime Spectroscopy, and Two-Dimensional Gel Electrophoresis

  • E. D. Lipson
  • P. Galland
  • J. A. Pollock
Part of the Proceedings in Life Sciences book series (LIFE SCIENCES)


Phycomyces responses to blue light include phototropism, the light-growth response, light-induced carotene synthesis, and light-induced initiation of sporangiophores and sporangia (review: [7, 14]; Cerdà-Olmedo, this vol.). Action spectra for phototropism and the light-growth response [3] and several other lines of evidence (review: [7]; see also [12]) were compatible with the assumption of a single photoreceptor for most or all of these responses, probably a flavoprotein in the plasma membrane. However, it was found recently that more than one chromophore is involved in phototropism. Phototropic action spectra extended to a wavelength of 740 nm show a small peak at 630 nm (Löser and Schäfer, this vol., [5]). This peak probably corresponds to a new pigment since red light of wavelength 605 nm can partly revert phototropism elicited by low intensity blue light at 450 nm [10]. In the blue range, 380 to 500 nm, phototropism seems also to be mediated by more than one photoreceptor, since phototropic action spectra measured by two methods (photogeotropism and phototropic balance; see below) differ substantially [5].


Action Spectrum Photon Fluence Rate Blue Light Receptor Action Spectroscopy Adaptation Kinetic 
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Copyright information

© Springer-Verlag Berlin Heidelberg 1984

Authors and Affiliations

  • E. D. Lipson
  • P. Galland
  • J. A. Pollock
    • 1
  1. 1.Department of PhysicsSyracuse UniversitySyracuseUSA

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