At a glance
Essentials
- Habitat
- Associated with soil and plants; the rhizosphere is a frequent natural habitat.
Observation guide
What to look for
- 01
Its cells are rod-shaped, a feature visible under a microscope.
- 02
It is Gram-positive, a characteristic observed with Gram staining.
- 03
It can form endospores, structures distinguishable from vegetative cells using appropriate stains.
Lighting, age and viewing angle can hide features. If identification affects consumption, handling or conservation, consult specialist sources.
Ecology
Description and characteristics
Bacillus subtilis is a Gram-positive bacterium with elongated, rod-shaped cells. It forms endospores, resistant structures that allow it to persist when the environment becomes unfavorable.
It is associated with soil and plants; the rhizosphere, the zone of soil influenced by roots, is one of its frequent natural habitats. This association places it in communities where it interacts with other microorganisms.
It can multiply by binary fission, which produces two daughter cells, or form an endospore through asymmetric division. Endospores can remain viable for decades and withstand adverse environmental conditions.
In in vitro studies of 26 isolates, production of numerous volatile compounds was recorded, but the profiles varied widely among isolates. Some of these compounds may participate in interactions with other organisms, for example through signaling or antimicrobial activity; therefore, these results do not describe all strains equally.