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Der Einfluss des Lichtes auf die Bewegung der Cyanophyceen

II. Mitteilung Photokinesis beiPhormidium autumnale

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Summary

A method for quantitative evaluation of the photokinetic action in Cyanophyceae is described. The value of the photokinetic action, i.e. the quotient of distances covered in light and dark, was determined forPhormidium autumnale in white and monochromatic light. From 0.02 to 30000 lux the photokinetic reaction ofPh. autumnale is positive, above 30000 lux negative. The zero threshold of photokinesis is at 0.01–0.02 lux, the optimum at 2000 lux.

By means of an interference filter monochromator system the action spectrum of photokinesis was determined for the range between 317 and 800 mμ under conditions of equal quantum flux related to an energy of 1000 erg/cm2·sec at 670 mμ. These results were compared with the pigment absorptionin vitro andin vivo.

The main maximum at 680 mμ and the smaller peak at 620 mμ coincide with the absorption maxima of chlorophyll a in the living cell. The region 430–440 mμ was also active without a distinct maximum. Irradiation of the principal absorption region of the carotenoids and phycobilins is only slightly effective for the latter. The distinct maximum at 390 mμ and the strong action of UV and blueviolet light must be due to an unknown pigment.

Thus visible irradiation is photokinetically effective according to its absorption by chlorophyll a, whereas no or little relation exists to carotenoids and phycobilins.

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Authors and Affiliations

  1. Botanischen Institut der Universität Tübingen, Wilhelmstr. 5, Tübingen

    Wilhelm Nultsch

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  1. Wilhelm Nultsch
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Herrn Prof. Dr. Dr. h.c.E. G. Pringsheim zum 80. Geburtstag gewidmet.

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Nultsch, W. Der Einfluss des Lichtes auf die Bewegung der Cyanophyceen. Planta 57, 613–623 (1962). https://doi.org/10.1007/BF01930343

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