Abstract
Major biochemical and ultrastructural changes occur in Dictyostelium discoideum plasma membranes following aggregation of the amoebae. The effects of cyclic AMP, Concanavalin A (Con A), and disruption of cell contacts on membrane particle synthesis and the subsequent differentiation of prespores and mature spores were determined. The results indicated that prespore cell differentiation always failed under conditions in which large particle formation was inhibited or cells bearing particles were restricted in their contacts. Although prespore cells exposed to Con A formed mature spores devoid of prespore vacuoles, the cell walls were defective. The research suggests that the interactions between membrane particles of apposing amoebae may initiate differentiation of prespores and mature spores.
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