Effects of sporulation in an extremely poor medium on Bacillus subtilis spore resistance, germination, and physical properties.

Spores of Bacillus subtilis formed in an extremely poor medium show significantly decreased resistance and altered germination dynamics compared to those formed in rich media.

• Why it matters: Understanding spore resistance and germination is crucial because Bacillus spores can cause food spoilage and human diseases, yet most studies focus on spores produced in rich media, leaving a knowledge gap about spores formed under nutrient-poor conditions.
• What they did: The study compared spores produced in rich versus extremely poor liquid media, analyzing resistance to heat, hydrogen peroxide, and formaldehyde, as well as membrane permeability, fluidity, and germination rates with various germinants.
• The result: Spores from poor media exhibited lower resistance, increased inner membrane permeability and fluidity, and faster germination with non-GR germinants, providing new insights into spore resilience and germination mechanisms.