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Rice stripe virus NS3 uses the host signaling pathways to control pathogenicity.

Xinjian Zhuang1, Chenwei Feng1, Yanhong Hua1

  • 1Department of Plant Protection, College of Plant Protection, Yangzhou University, Yangzhou 225009, Jiangsu, P.R. China.

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Rice stripe virus (RSV) manipulates host defenses by altering its NS3 protein. This strategy balances viral pathogenicity and transmissibility for long-term survival in rice plants and insect vectors.

Keywords:
NS3SnRK3spathogenicity-transmission trade-offphosphorylationrice stripe virus

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Area of Science:

  • Plant Virology
  • Molecular Plant-Pathogen Interactions
  • Insect Vector Biology

Background:

  • Viruses significantly impact global agriculture, necessitating an understanding of their host-pathogen dynamics.
  • Rice stripe virus (RSV), transmitted by the planthopper Laodelphax striatellus, causes substantial damage to rice crops.
  • Viral adaptation strategies for sustainable host and vector interactions remain largely unknown.

Purpose of the Study:

  • To elucidate the molecular mechanisms by which RSV modulates its pathogenicity and transmissibility.
  • To investigate the role of the viral NS3 protein in manipulating host antiviral pathways and signaling.
  • To identify the co-survival strategies employed by RSV within the virus-vector-host interaction system.

Main Methods:

  • Analysis of viral NS3 protein interactions and phosphorylation status during infection.
  • Investigation of calcium (Ca2+) signaling pathways and reactive oxygen species (ROS) production in infected plants.
  • Assessment of host antiviral RNA interference (RNAi) pathway modulation by RSV.
  • Evaluation of viral pathogenicity and transmissibility under different infection stages.

Main Results:

  • Early RSV infection involves limited NS3 self-interaction, suppressing host RNA interference (RNAi) and inducing a ROS burst via Ca2+-OsSnRK3.25-OsCBL1/3-OsRBOHs signaling, leading to high pathogenicity.
  • Late infection stages show abundant NS3 phosphorylation, enhancing host RNAi while disrupting the OsSnRK3.25 signaling pathway, resulting in reduced pathogenicity and transmissibility.
  • RSV actively manipulates host defense mechanisms through NS3 phosphorylation and interaction with OsSnRK3.25.

Conclusions:

  • RSV employs a dynamic strategy, fine-tuning its pathogenicity and transmissibility via NS3 phosphorylation and hijacking host signaling pathways.
  • The virus maintains a delicate balance within the virus-host-vector interaction, optimizing its long-term survival.
  • This study reveals a sophisticated co-survival strategy essential for the persistence of RSV in its ecological niche.