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Root-Knot-Nematode-Encoded CEPs Increase Nitrogen Assimilation.

Shova Mishra1, Weiming Hu1, Peter DiGennaro1

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Root-knot nematodes (RKNs) use C-terminally encoded peptides (CEPs) to manipulate plant nitrogen uptake and root development. These nematode-secreted signals enhance nutrient assimilation for parasite benefit.

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Area of Science:

  • Plant-nematode interactions
  • Molecular signaling in plants
  • Agricultural science

Background:

  • C-terminally encoded peptides (CEPs) are crucial plant developmental signals involved in growth and nitrogen stress responses.
  • CEPs are conserved across vascular plants and have been identified in plant parasitic nematodes.
  • Root-knot nematodes (RKNs) are significant agricultural pests that interact intimately with host plants.

Purpose of the Study:

  • To identify RKN-encoded CEP-like peptides and investigate their function in plant-nematode interactions.
  • To determine the impact of RKN CEP-like peptides on plant root development and nitrogen metabolism.
  • To understand how these nematode signals influence host plant physiology.

Main Methods:

  • Bioinformatic screening of RKN genomes to identify CEP-like sequences.
  • Exogenous application of RKN CEP-like peptides to model plants (A. thaliana, M. truncatula).
  • Analysis of root phenotypes, nitrogen uptake (using 15N/14N isotope tracing), and gene expression (nitrate transporters).

Main Results:

  • 61 CEP-like sequences were identified in six RKN species.
  • Exogenous RKN CEP application altered plant root architecture (e.g., reduced lateral roots, inhibited primary root growth).
  • RKN CEPs increased plant nitrogen uptake, upregulated root nitrate transporter genes, and enhanced nematode metabolism.

Conclusions:

  • RKN-encoded CEP-like peptides are key effectors in the plant-nematode interaction.
  • These peptides manipulate host nitrogen assimilation and root development to benefit the parasite.
  • Understanding these signals offers insights into regulating plant nitrogen use and developing novel nematode control strategies.