Abstract
In the brown alga Dictyota dichotoma Lamour the phaeoplasts move to the anticlinal walls (profile position) in strong light and to the periclinal walls (face position) in dim light. By these movements transmittance changes are caused. If the algae were grown in light:dark cycles of about natural daylengths, circadian oscillations of the amplitudes and the kinetics of these transmittance changes are initiated. The lengths of the free running periods vary between 24 and 29 h. In addition, light:dark grown thalli were transferred into continuous dim or strong light or darkness, in order to check whether or not the rhythms continued under these conditions. By taking photomicrographs of intact thalli and of isolated cortical cell layers, prepared by bisecting, it could be shown that the maxima and minima of circadian transmittance changes correspond well with the number of phaeoplasts at the periclinal cell walls. The ecological relevance of these phenomena is discussed.
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Literature cited
Britz, St. J.: Studies on a circadian rhythm of chloroplast movement in Ulva, 228 pp. Ph.D. thesis, Harvard University, Cambridge, Massachusetts 1976
Britz, St. J. and W. R. Briggs: Circadian rhythms of chloroplast orientation and photosynthetic capacity in Ulva. Plant Physiol. 58, 22–27 (1976)
Britz, St. J., J. Pfau, W. Nultsch and W. R. Briggs: Automatic monitoring of a circadian rhythm of change in light transmittance in Ulva. Plant Physiol. 58, 17–21 (1976)
Bünning, E.: The physiological clock, 2nd ed. New York: Springer Verlag 1967
Busch, G.: Über die photoperiodische Formänderung der Chloroplasten von Selaginella serpens. Biol. Zbl. 72, 598–629 (1953)
Flohrs, H. and W. Haupt: Tagesperiodische Empfindlichkeits-schwankungen der licht-induzierten Chloroplastenbewegung von Mougeotia. Z. Pflanzenphysiol. 65, 65–69 (1971)
Herman, E. M. and B. M. Sweeney: Circadian rhythm of chloroplast ultrastructure in Gonyaulax polyedra, concentric organization around a central cluster of ribosomes. J. ultrastruct. Res. 50, 347–354 (1975)
Koop, H.-U., R. Schmid, H. H. Heunert and B. Milthaler: Chloroplast migration: a new circadian rhythm in Acetabularia. Protoplasma 97, 301–310 (1978)
Nultsch, W. and J. Pfau: Occurrence and biological role of light-induced chromatophore displacements in seaweeds. Mar. Biol. 51, 77–82 (1979)
Nultsch, W. and J. Pfau: Do correlations exist between chromatophore arrangement and photosynthetic activity in seaweeds? Mar. Biol. 62, 111–117 (1981)
Nultsch, W. and J. Pfau: Investigations on light induced plastid movement in seaweeds. In: Proc. Eighth International Seaweeds Symp., Bangor, North Wales, The Marine Science Laboratories, Menai Bridge, pp. 209–216. Ed. by G. E. Fogg and W. E. Jones. 1981
Pfau, J.: Studien zur Chromatophorenbewegung der Braunalge Dictyota dichotoma, 114 pp. Dr. thesis, Philipps Universität, Marburg 1974
Pfau, J., G. Throm and W. Nultsch: Recording microphotometer for determination of light induced chromatophore movements in brown algae. Z. Pflanzenphysiol. 71, 242–260 (1974)
Rüffer, U., J. Pfau and W. Nultsch. Movements and arrangements of Dictyota phaeoplasts in response to light and darkness. Z. Pflanzenphysiol. 101, 283–293 (1981)
Senn, G.: Die Gestalts- und Lageveränderung der Pflanzen-Chromatophoren, 397 pp. Leipzig: Wilhelm Engelmann 1908
Seen, G.: Weitere Untersuchungen über Gestalts- und Lageveränderung der Chromatophoren. Z. Bot. 11, 81–141 (1919)
Swift, E. and W. R. Taylor: Bioluminescence and chloroplast movement in the dinoflagellate Pyrocystis lunula. J. Phycol. 3, 77–81 (1967)
Van den Driessche, T.: Circadian rhythms in Acetabularia: photosynthetic capacity and chloroplast shape. Exp. Cell Res. 42, 18–30 (1966)
Van den Driessche, T. and R. Hars: Variations de l'ultrastructure des chloroplasts d'Acetabularia I. Algues entières. J. Microsc. 15, 85–90 (1972)
Zurzycka, A. and J. Zurzycki: Studies on the phototactic movements of chloroplasts. I. Acta Soc. Bot. Polon. 22, 667–678 (1953)
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Communicated by O. Kinne, Hamburg
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Nultsch, W., Rüffer, U. & Pfau, J. Circadian rhythms in the chromatophore movements of Dictyota dichotoma . Marine Biology 81, 217–222 (1984). https://doi.org/10.1007/BF00393215
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DOI: https://doi.org/10.1007/BF00393215