Photoreception in Chlamydomonas
When the unicellular photosynthetic alga Chlamydomonas is faced with changes in direction, wavelength or intensity of the ambient light, it exhibits distinct behavioral responses, which are direction changes if the changes are small or stop responses upon larger changes. At continuous irradiation Chlamydomonas orients to or away from the light source (positive or negative phototaxis). These movement responses have been under investigation for more than 100 years (Pfeffer, 1904; Nultsch and Häder, 1988) but neither the photoreceptor nor the signal transduction process have been characterized in detail.
KeywordsSignal Transduction Process Negative Phototaxis Calcium Channel Inhibitor Trans Retinal Retinal Chromophore
Unable to display preview. Download preview PDF.
- Beckmann, M., and Hegemann, P., 1991, In vitro identification of rhodopsin in the green alga Chlamydomonas, Biochemistry, submitted.Google Scholar
- Harz, H., and Hegemann, P., 1991, Rhodopsin-regulated ion channel activation in Chlamydomonas, Biophys. J., submitted.Google Scholar
- Pfeffer, W., 1904, “Pflanzenphysiologie,” Leipzig.Google Scholar
- Takahashi, T., Yan, B., Mazur, P., Derguini, F., Nakanishi, K., and Spudich, J., 1990, Color regulation in the archibacterial phototaxis receptor phoborhodopsin (sensory rhodopsin II), Biochemistry in press.Google Scholar
- Uhl, R., and Hegemann, P., 1990b, Probing visual transduction in a plant cell. Optical recording of rhodopsin-induced structural changes from Chlamydomonas, Biophys. J., in press.Google Scholar