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. 1971 Dec;22(6):1076–1084. doi: 10.1128/am.22.6.1076-1084.1971

Physiological Studies of an Oligosporogenous Strain of Bacillus popilliae1

Ralph N Costilow 1, Wilson H Coulter 1,2
PMCID: PMC376488  PMID: 4944806

Abstract

A relatively small but consistent increase in the frequency of spore formation by an oligosporogenous strain of Bacillus popilliae (NRRL B-2309M) was obtained by adding 0.1% sodium pyruvate to the sporulation medium. The frequency of spore formation was essentially the same when a low level of glucose, trehalose, or glucose-6-phosphate or a high level of α-methyl-d-mannoside was added as the carbon and energy source. Many other variations in the cultural medium and cultural conditions failed to enhance spore formation of 2309M, and no spores were found in four asporogenic strains under any of the conditions tried. There were no significant differences between the 2309M strain and three nonsporeforming cultures with respect to (i) the rate and extent of growth, (ii) the rates of glucose utilization, or (iii) volatile acid production and utilization. None of the cultures tested was found to produce detectable levels of extracellular protease or an antibiotic. The only consistent marker found associated with spore formation was the development of catalase activity, and this activity was stimulated by heating at 80 C for 10 min. This was not found unless morphological evidence of spore formation was observed. The germination of the spores formed by 2309M in vitro was stimulated by heat shock and by the addition of pyruvate to the germination medium.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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