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Plant and Cell Physiology, 1986, Vol. 27, No. 5 837-851
© 1986

Article

Light-Regulated Translocation of Cytoplasm in Green Alga Dichotomosiphon

Takami Maekawa, Izuo Tsutsui and Reiko Nagai

Department of Biology, College of General Education, Osaka University Toyonaka 560, Osaka, Japan

Chloroplasts and other cytoplasmic granules in the freshwater coenocytic green alga Dichotomosiphon tuberosus streamed bidirectionally along the longitudinal axis of its tubular body. In response to light stimuli, the organelles migrated toward the apical regions and accumulated there. In the dark, they migrated toward the basal regions and stayed there. The cytoplasmic streaming and the light-regulated movement were inhibited by the presence of 5 x 10–4 M colchicine, but not by 100µg/ml cytochalasin B. Local illumination with blue light caused reversible accumulation of the organelles in the illuminated zone. Single arrays of microtubules were found in the ectoplasmic layer of the alga, and both single and bundle arrays in the endoplasm. The endoplasmic microtubules disintegrated when the alga was treated for 24 h with colchicine. The involvement of the microtubules in the motive force generation for the bidirectional streaming and translocational movement of the organelles is discussed.

(Received December 27, 1985; Accepted April 16, 1986)
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