Abstract
SUMMARY In the green alga Hydrodictyon reticulatum (L.) Lager-heim (Chlorococcales, Chlorophyceae), zoospores are arranged in a regular fashion to form an intricate hexagonal network during the asexual reproductive cycle. Polypeptides that bind concanavalin A (Con A) in zoospores increased in amount during net formation and decreased after the completion of the adhesion between zoospores. Fluorescein isothiocyanate-Con A-binding sites corresponded to the contact sites of zoospores immediately after cessation of the movement. Treatment with 25 μg mL−1 Con A inhibited adhesion of isolated immotile zoospores obtained from parental cells, and Con A-treated zoospores could not form hexagonal nets. Moreover, when isolated immotile zoospores were treated with Con A, the cessation of the zoospore movement was retarded in dose-dependent manner. These results suggest that the Con A-binding sites may participate in the adhesion of zoospores during hexagonal net formation.
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