Science & Nature • Bacteriology

Bacillus subtilis

Bacillus subtilis is a Gram-positive, rod-shaped bacterium found widely in soil and other environments.

By Ethan Anderson| Reviewed by Olivia Bennett, Standards & Fact-Checking Lead| Updated July 26, 2026|2 min read| Fact-checked

Bacillus subtilis is a Gram-positive, rod-shaped bacterium found widely in soil and other environments. It is a well-studied model organism in microbiology and biotechnology, known for forming tough endospores and for its use in research and industrial enzyme production. In Canada, it is used in studies of fermentation, enzymes, and biological control.

Characteristics

Bacillus subtilis is a Gram-positive, catalase-positive, rod-shaped bacterium that is typically motile. It is known for forming resilient endospores and for its ability to form biofilms.

Habitat and ecology

The species is commonly associated with soil, vegetation, and a range of natural environments. Sources also report its presence in the gastrointestinal tracts of ruminants, humans, and marine sponges.

Research importance

B. subtilis is a major model organism for studying bacterial chromosome replication, cell differentiation, sporulation, biofilms, and protein secretion. Its natural competence has made it especially valuable for genetic studies.

Industrial and practical uses

The species is used on an industrial scale in biotechnology, particularly for secreted enzyme production. It also appears in applications related to fermentation, plant biocontrol, and agricultural use.

Key facts

It is commonly found in soil and has also been reported in the gastrointestinal tracts of some animals and humans.
It forms endospores, which help it survive harsh environmental conditions.
It is one of the best-studied Gram-positive bacteria and is widely used as a model organism.
It is naturally competent, which makes it useful in genetic research.
It has major industrial uses, especially in the production and secretion of enzymes and other bioproducts.

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Canadian context

Bacillus subtilis is relevant to Canadian microbiology, biotechnology, agriculture, and food-science research, where it is used as a model organism and in studies of fermentation, enzymes, and biological control.

Frequently asked questions

What kind of bacterium is Bacillus subtilis?

It is a Gram-positive, rod-shaped, catalase-positive bacterium in the genus Bacillus.

Where is Bacillus subtilis found?

It is commonly found in soil and vegetation, and it has also been reported in animal and human gastrointestinal tracts.

Why is Bacillus subtilis important in science?

It is a major model organism for studying bacterial growth, differentiation, sporulation, biofilms, and gene function.

Does Bacillus subtilis form spores?

Yes. It forms protective endospores that allow it to survive extreme conditions.

Is Bacillus subtilis used in industry?

Yes. It is widely used in biotechnology, especially for producing and secreting enzymes.

References

Wikipedia — https://en.wikipedia.org/wiki/Bacillus_subtilis
Supports: General description, morphology, habitat, motility, endospore formation, biofilms, model-organism status, industrial use
PubMed Central — https://pmc.ncbi.nlm.nih.gov/articles/PMC10210981/
Supports: Study status, spore survival, scientific interest, environmental distribution
Trends in Microbiology — https://www.cell.com/trends/microbiology/fulltext/S0966-842X(19)30072-1
Supports: Model-organism importance, natural competence, sporulation, applications in enzyme production and biocontrol
PubMed Central — https://pmc.ncbi.nlm.nih.gov/articles/PMC7376258/
Supports: Model organism status, genetic toolbox, industrial relevance, cell dimensions, plant-growth promotion
Journal of Bacteriology — https://journals.asm.org/doi/10.1128/jb.00102-23
Supports: Historical naming by Ferdinand Cohn and taxonomic context