Dynamic and distinct physiological responses by a soil bacterium promote survival along a desiccation continuum.

Starved Pseudomonas synxantha cells enhance desiccation tolerance by rigidifying membranes, despite not synthesizing osmolyte NAGGN during water and nutrient limitations.

• Why it matters: Understanding how soil bacteria survive desiccation is vital for soil health and agriculture, especially as drying conditions worsen. The mechanisms behind bacterial resilience under water and nutrient stress remain unclear, limiting efforts to improve soil microbial stability.
• What they did: The study used single-cell measurements of growth, cell size, and gene expression in P. synxantha exposed to simulated soil drying trajectories, focusing on osmolyte production and physiological changes under starvation and osmotic stress.
• The result: Prior starvation prevents cell lysis upon rewetting and increases membrane rigidity, enabling bacteria to withstand more severe water stress, revealing cellular factors that contribute to desiccation tolerance along drying trajectories.