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Spores of all strains ofDictyostelium discoideum tested in this study germinated after a heat shock of 45 C for 30 min. Whereas the strains differed in their rates of germination, the rate for each strain was constant. A correlation existed between the rate of germination and the rate of vegetative growth when spores were inoculated into bacterial streaks. Heat shock clearly increased spore germination inD. purpureum , but the response was less dramatic than inD. discoideum . Enhancement also occurred inD. rosarium , but only in media containing peptone. Strains ofD. mucoroides gave varied responses, and these could be divided into those which required mutrients for spore germination and those which did not. The spores ofPolysphondylium pallidum were resistant to mild heat (45 C), but were not activated; peptone was required for germination. In contrast, the microcysts of this species were heat-labile and required no added nutrients for excystment.

Spore Germination in Strains of Dictyostelium discoideum and Other Members of the Dictyosteliaceae