Calcofluor staining of cellulose during microcyst differentiation in wild-type and mutant strains of Polysphondylium pallidum

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Abstract
Calcofluor White ST was used to monitor the morphological events in the biogenesis of cellulose in the microcyst wall of the wild-type strain (WS-320) and 2 developmental mutants (mic-1 and mic-2) of P. pallidum. During encystment, the cell surface acquires a Calcofluor-specific material which appears to be cellulose because of its sensitivity to purified cellulase. Cellulose-containing vesicles appear near the cell surface. Subsequently, the cell surface strains with Calcofluor, and the vesicles are no longer detectable. Intracellular vesicles resembling the cellulose-rich vesicles in size, in the timing of appearance and in cellular location are also seen in thin sections. These vesicles are surrounded by a single unit membrane, and their amorphous matrix, which contains a dense irregular core, further implicates them as the basis for the bilayered microcyst wall.

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