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Light-induced Adhesion of Spirogyra Cells to Glass ¹

^a Department of Biology, Faculty of Science, Osaka University, Toyonaka, Osaka, 560 Japan

Adhesion of Spirogyra (tentatively, Spirogyra fluviatilis) cells to glass is described. The cells of an algal filament can adhere to a substrate only when they are located at the end of the filament. Rapid adhesion is induced by blue-violet light (blue adhesion) as well as by temperature shift (about 6 C about 22 C) or shaking (dark adhesion). Adherent cells detach in 1 hour in the absence of one of these stimuli. Slow adhesion is induced by red light (red adhesion) 1 hour after irradiation, and may be controlled by phytochrome. A cell once caused to adhere by red light does not release from the glass.

Adhesion seems to be maintained by a cementing substance, probably qa mucoprotein. A transparent material which appears around the tip of the cell may be the cementing substance.

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