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Root Border Cells and Their Role in Plant Defense.

Martha Hawes1, Caitilyn Allen2, B Gillian Turgeon3

  • 1Department of Soil, Water and Environmental Sciences, Bio5 Institute, University of Arizona, Tucson, Arizona 85721; email: mhawes@email.arizona.edu , curlango@email.arizona.edu , dahuskey@email.arizona.edu.

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Summary
This summary is machine-generated.

Plant root border cells form extracellular traps similar to immune cells, protecting against pathogens. Inhibiting bacterial and fungal extracellular DNases (exDNases) reduces plant infection, suggesting new disease control strategies.

Keywords:
exDNAexDNaseextracellular trapsrhizosphereroot cap slime

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Area of Science:

  • Plant Biology
  • Microbiology
  • Immunology

Background:

  • Root border cells are specialized plant cells that detach from root tips.
  • Their precise function in plant defense has remained largely unknown.
  • Recent research suggests a role analogous to mammalian neutrophils in immunity.

Purpose of the Study:

  • To investigate the role of root border cells in plant defense mechanisms.
  • To explore the function of extracellular DNA (exDNA) and antimicrobial proteins in border cell secretions.
  • To determine the impact of extracellular DNases (exDNases) from pathogens on plant-root interactions.

Main Methods:

  • Comparative analysis of border cell secretions and mammalian neutrophil extracellular traps.
  • Experimental addition of DNase I to plant root tips to assess its effect on infection resistance.
  • Genetic mutation of exDNase genes in plant pathogens (Ralstonia solanacearum, Cochliobolus heterostrophus) to evaluate virulence.

Main Results:

  • Root border cells secrete a complex of extracellular DNA (exDNA) and antimicrobial proteins, forming protective traps.
  • Addition of DNase I to root tips disrupted these extracellular traps and reduced resistance to pathogen infection.
  • Mutations in bacterial and fungal exDNase genes led to decreased pathogen virulence against plants.

Conclusions:

  • Plant root border cells function similarly to mammalian neutrophils, employing extracellular traps for defense.
  • Extracellular DNases produced by plant pathogens play a crucial role in their virulence and spread.
  • Targeting pathogen exDNase activity presents a promising strategy for developing novel plant disease control methods.