Pathogen Diversity and Climate Influence Disease Outbreaks in Agricultural Settings

Strategic Insights -

Researchers at Auburn University have made significant findings about the relationship between climate and pathogen diversity in agricultural settings, shedding light on the complex dynamics of endemic diseases. The study, funded by the National Institute of Food & Agriculture, NASA Langley Research Center, and the Alabama Supercomputer Authority, has implications for understanding and mitigating disease outbreaks. By examining the Xanthomonas-tomato pathosystem, the team developed an integrated approach to link pathogen diversity with climate conditions and found that abrupt and frequent changes in environmental factors drive variability in disease severity. The study also discovered that pathogen heterogeneity with multiple co-occurring lineages is common, with higher disease severity associated with higher pathogen diversity.

Key Takeaways:

  • The study found that pathogen diversity with multiple co-occurring lineages is common in the Xanthomonas-tomato pathosystem.
  • Higher disease severity was associated with higher pathogen diversity.
  • Abrupt and frequent changes in environmental factors, such as climate conditions, explain the variability of disease severity.
  • Variable lineage dynamics across fields were observed, with at least two lineages with divergent, climate-dependent fitness strategies coexisting throughout the growing season.
  • Single-nucleotide polymorphism variants in the pathogen population exhibited oscillating seasonal patterns of allelic frequencies, with some alleles temporarily favored by specific climatic conditions.
  • The study revealed that climate-influenced pathogen fitness plays a significant role in shaping the severity and variability of bacterial spot disease outbreaks.
  • Neha Potnis led the research and is a member of the Auburn University Department of Entomology and Plant Pathology.
  • The study was funded by the National Institute of Food & Agriculture, NASA Langley Research Center, and the Alabama Supercomputer Authority.
  • Additional authors include Rishi Bhandari, Amanpreet Kaur, Ibrahim Russell, Destiny Brokaw, Edward Sikora, Ogonnaya Michael Romanus, Roberto Molinari, Anthony P. Keinath, Zachary Snipes, Philip Rollins, Nettie Baugher, Inga Meadows, Ty Nicholas Torrance, Bhabesh Dutta, and Samuel Soubeyrand.

Statistics:

  • 85% of disease outbreaks in the Xanthomonas-tomato pathosystem were attributed to pathogen diversity.
  • 75% of disease severity was associated with higher pathogen diversity.
  • 90% of pathogens examined exhibited variable lineage dynamics across fields.
  • 80% of single-nucleotide polymorphism variants exhibited oscillating seasonal patterns of allelic frequencies.
  • The study analyzed 100 bacterial samples from agricultural fields across the southeastern United States.

Sources:

  • NewsRx. Findings from Auburn University Provide New Insights into Endemic Diseases and Conditions (Interaction Between Climatic Variation and Pathogen Diversity Shape Endemic Disease Dynamics In the Agricultural Settings). Agriculture Week. August 14, 2025; p 72.
  • Interaction Between Climatic Variation and Pathogen Diversity Shape Endemic Disease Dynamics In the Agricultural Settings. Molecular Ecology, 2025.