f Stimulation of Germination of Unactivated Bacillus cereus Spores by Ammonia
- Authors: Robert A. Preston, Harry A. Douthit
- First Published Online: 01 May 1984, Microbiology 130: 1041-1050, doi: 10.1099/00221287-130-5-1041
- Subject: Physiology And Growth
- Issue Published:
Inclusion of ammonia in germinant mixtures containing L-alanine and inosine stimulated germination of unactivated Bacillus cereus spores at rates equal to those obtained using heat-activated spores without ammonia. D-Alanine had little effect on germination of heat-activated spores, but severely inhibited germination of unactivated spores in the presence of ammonia. Ammonia did not replace the requirement for either L-alanine or inosine: all three compounds were required for rapid germination. Kinetic analysis suggested that the functions of ammonia and L-alanine were more closely related than the functions of ammonia and inosine. With rate-saturating concentrations of L-alanine and inosine, germination rates showed saturation kinetics for ammonia with a K m for NH4C1 of 5 mM. Comparisons of the effects of salts, amines and pH on germination rates suggested that NH4OH rather than NH4 + was the rate-limiting form of ammonia. In comparisons of various strains of B. cereus, stimulation of germination by ammonia occurred in all cases, although spores of most soil isolates germinated more rapidly than B. cereus T spores in the absence of ammonia.
© Society for General Microbiology 1984 | Published by the Microbiology Society
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