Soil extracellular DNA fragments show variable degradation rates among sequences and environmental conditions.

Soil extracellular DNA fragments degrade at rates ranging from 0.05 to 0.16 day^-1, with variability influenced by environmental factors across different sites in China.

• Why it matters: Understanding eDNA degradation is crucial for accurate soil microbiome analysis and environmental DNA applications, yet its kinetics are poorly characterized.
• What they did: A primer-labeled DNA method combined with microcosm incubation was used to measure sequence-specific and overall degradation rates of eDNA across diverse soil conditions, analyzing 16S rRNA gene fragments.
• The result: Degradation rates correlated with soil moisture, pH, nitrogen, and temperature, revealing environmental impacts on eDNA persistence and guiding improvements in microbial and environmental DNA research.