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Understanding the Impact of Salt Stress on Plant Pathogens Through Phenotypic and Transcriptomic Analysis.

Hyejung Jung1,2, Gil Han1, Duyoung Lee1

  • 1Department of Integrated Biological Science, Pusan National University, Busan 46241, Republic of Korea.

Plants (Basel, Switzerland)
|January 11, 2025
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Soil salinity impacts plant pathogens differently. Some bacteria struggle with salt stress, while others adapt, offering new disease management strategies for agriculture under climate change.

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climate changecomparative transcriptomic analysishigh salinityplant pathogensalt stresssalt tolerancevirulence

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Area of Science:

  • Plant Pathology
  • Microbiology
  • Environmental Science

Background:

  • Plant diseases require pathogens, hosts, and optimal environmental conditions.
  • Increasing soil salinity poses significant threats to agricultural ecosystems.
  • The specific interactions between plant pathogens and salinity are not fully understood.

Purpose of the Study:

  • To investigate the effects of salt stress on key plant pathogens.
  • To characterize the molecular responses of pathogens to salinity.
  • To explore potential management strategies for salinity-affected plant diseases.

Main Methods:

  • Phenotypic assays were used to assess pathogen growth, motility, and enzyme production under salt stress.
  • Pan-genome-based comparative transcriptomics identified differential gene expression patterns.
  • Field trials evaluated the efficacy of a beneficial bacterium in managing disease under salt stress.

Main Results:

  • Burkholderia gladioli and Ralstonia solanacearum showed high sensitivity to salt stress, with reduced growth and function.
  • Pectobacterium carotovorum subsp. carotovorum (Pcc) exhibited notable salt tolerance, with upregulated survival mechanisms.
  • Co-downregulated pathways in sensitive species included chemotaxis and type III secretion systems.
  • Upregulated pathways in tolerant Pcc involved protein quality control, osmotic balance, and iron uptake.
  • Combined salt stress and Chryseobacterium salivictor application significantly reduced tomato wilt.

Conclusions:

  • Pathogen responses to salt stress vary significantly, impacting disease establishment.
  • Transcriptomic data reveals distinct adaptive strategies in tolerant versus sensitive pathogens.
  • The beneficial bacterium Chryseobacterium salivictor shows potential for managing salinity-induced plant diseases.
  • Understanding these interactions is crucial for developing resilient agricultural practices under climate change.