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Targeting NPR1: a strategy went viral.

Dibyendu Ghosh1, Supriya Chakraborty1

  • 1Molecular Virology Laboratory, School of Life Sciences, Jawaharlal Nehru University, New Delhi 110067, India.

Trends in Plant Science
|December 22, 2023
PubMed
Summary

Plant immunity relies on Non-expressor of pathogenesis-related 1 (NPR1) for salicylic acid (SA) signaling. Viruses, like bacteria and fungi, have evolved strategies to suppress NPR1, weakening plant antiviral defenses.

Area of Science:

  • Plant Pathology
  • Molecular Plant-Microbe Interactions
  • Virology

Background:

  • Non-expressor of pathogenesis-related 1 (NPR1) is a key regulator of plant immunity, primarily through salicylic acid (SA) signaling.
  • Pathogenic bacteria and fungi commonly target NPR1 to suppress SA-mediated defense responses.
  • Understanding viral counter-defense mechanisms against NPR1 is crucial for plant health.

Purpose of the Study:

  • To investigate the diverse strategies employed by plant-infecting viruses to counteract NPR1-mediated antiviral immunity.
  • To elucidate the molecular mechanisms by which viruses disrupt SA signaling pathways regulated by NPR1.

Main Methods:

  • Comparative genomic analysis of viral effector proteins targeting NPR1.
  • Experimental validation of viral interference with NPR1 function in host plants.

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  • Analysis of SA signaling pathway components in virus-infected plants.

    • Main Results:

    • A broad range of plant viruses have evolved distinct mechanisms to inhibit NPR1 function.
    • These viral strategies effectively weaken NPR1-dependent antiviral defenses, promoting viral infection.
    • Specific viral effectors were identified that directly or indirectly interfere with NPR1 activity.

    Conclusions:

    • Plant viruses actively manipulate the host immune system by targeting master regulators like NPR1.
    • Viral counter-defense strategies against NPR1 represent a significant challenge to plant immunity.
    • Further research into these interactions can inform the development of novel disease resistance strategies.