Affiliation:
1. Departments of Bacteriology and Botany, University of Wisconsin, Madison, Wisconsin 53706
Abstract
Spores of all strains of
Dictyostelium 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 in
D. purpureum
, but the response was less dramatic than in
D. discoideum
. Enhancement also occurred in
D. rosarium
, but only in media containing peptone. Strains of
D. mucoroides
gave varied responses, and these could be divided into those which required mutrients for spore germination and those which did not. The spores of
Polysphondylium 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.
Publisher
American Society for Microbiology
Subject
Molecular Biology,Microbiology
Reference10 articles.
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5. Properties of germinating spores of Dictyostelium discoideum;Cotter D. A.;J. Bacteriol.,1968
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