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A lectin S-domain receptor kinase mediates lipopolysaccharide sensing in Arabidopsis thaliana

Stefanie Ranf1, Nicolas Gisch2, Milena Schäffer3

  • 11] Stress and Developmental Biology, Leibniz Institute of Plant Biochemistry, Halle, Germany. [2] Phytopathology, TUM School of Life Sciences Weihenstephan, Technische Universität München, Freising-Weihenstephan, Germany.

Nature Immunology
|March 3, 2015
PubMed

Insights

Plants sense bacterial lipopolysaccharide (LPS) using the LORE receptor kinase. This discovery in Arabidopsis thaliana reveals a mechanism for detecting Gram-negative bacteria and offers potential for engineering crop resistance.

Area of Science:

  • Plant immunity
  • Microbe-associated molecular patterns (MAMPs) recognition
  • Plant-pathogen interactions

Background:

  • Innate immunity in plants and animals is triggered by sensing microbe-associated molecular patterns (MAMPs).
  • Lipopolysaccharide (LPS), a component of Gram-negative bacteria, is a key MAMP recognized by Toll-like receptor 4 (TLR4) in mammals.

Purpose of the Study:

  • To investigate the plant perception of bacterial lipopolysaccharide (LPS).
  • To identify the plant receptor responsible for LPS sensing and its role in immunity against bacterial pathogens.

Main Methods:

  • Isolation and characterization of LPS-insensitive mutants in Arabidopsis thaliana.
  • Genetic analysis of mutants defective in the LORE (SD1-29) receptor-like kinase.
  • Chemical degradation of LPS to identify the recognized moiety.
  • Heterologous expression of LORE in tobacco to assess its function in LPS sensing.

Main Results:

  • Arabidopsis thaliana specifically senses LPS from Pseudomonas and Xanthomonas species.
  • Mutants lacking the LORE receptor-like kinase (SD1-29) were hypersensitive to Pseudomonas syringae infection.
  • LORE primarily detects the lipid A component of LPS.
  • Expression of LORE in tobacco conferred LPS sensitivity, confirming its role in LPS perception.

Conclusions:

  • The LORE receptor-like kinase is crucial for sensing bacterial LPS in plants.
  • This mechanism provides plants with a means to detect Gram-negative bacterial pathogens.
  • Engineering LORE-mediated LPS sensing could enhance bacterial resistance in crop species.

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