Summary
Mougeotia cells with chloroplasts oriented in profile have been irradiated with small spots of monochromatic red polarized light in order to induce chloroplast movement.
In these experiments, four factors have been varied: 1. the orientation of the vibration plane of the light in relation to the cell axis, 2. the localization of the spot, i. e. irradiation of the chloroplast or the cytoplasm, 3. the spot size, and 4. the duration of the irradiation.
As a result of our experiments, we conclude that the photoreceptor molecules responsible for the light-induced chloroplast movement are localized in the cytoplasm.
As the photoreceptor of this reaction is the well known phytochromesystem, we may assume that also in other plants the phytochrome is localized in the cytoplasm rather than in the chloroplast.
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Bock, G., Haupt, W. Die Chloroplastendrehung beiMougeotia . Planta 57, 518–530 (1961). https://doi.org/10.1007/BF01937686
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DOI: https://doi.org/10.1007/BF01937686