1. 1 in tough conditions, cells jettisonnonessentials and enter stationary phase
  2. 2 they compact their DNA and protect it with RecA/RadA
  3. 3 some species send offspring insearch of better conditions to settle
  4. 4 others package them intotime capsules of spores
  5. 5 dormant spores can withstanddehydration, acid, and heat
  6. 6 waiting until conditions improveto germinate and resume active life

Summary

Concept Check Questions

• What is the function of RecA and RadA?

• What is the difference between the two daughters produced by Caulobacter crescentus division?

• What kind of macromolecule makes up the spore cortex? The spore coat?

• In diderms, which membrane forms the inner spore membrane? The outer spore membrane?

Further Reading

• Fendrihan et al. (2006). Extremely halophilic archaea and the issue of long-term microbial survival [75].

• Pletnev et al. (2015). Survival guide: Escherichia coli in the stationary phase [76].

• Tocheva et al. (2016). Sporulation, bacterial cell envelopes and the origin of life [77].

• Vreeland et al. (2000). Isolation of a 250 million-year-old halotolerant bacterium from a primary salt crystal [78].