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OsPIL1 Differentially Modulates Rice Blast Resistance Through Integrating Light or Darkness During Magnaporthe oryzae

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Summary

Darkness enhances rice immunity in plants overexpressing OsPIL1, while light compromises it. OsPIL1 acts as a negative regulator of plant immunity, with its interaction with OsINV3 contributing to resistance.

Keywords:
Magnaporthe oryzaedefence responseslight or darknessphytohormonesrice phytochrome‐interacting factor‐like 1 (OsPIL1)

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Area of Science:

  • Plant Biology
  • Plant Immunity
  • Molecular Genetics

Background:

  • Environmental factors like light and darkness critically regulate plant immune responses.
  • OsPIL1, a phytochrome-interacting factor-like protein, is linked to rice immunity against Magnaporthe oryzae, but its mechanism is unclear.

Purpose of the Study:

  • To investigate how OsPIL1 integrates light and darkness signals to modulate rice immunity.
  • To elucidate the molecular mechanisms underlying OsPIL1's role in plant defense.

Main Methods:

  • Comparative analysis of OsPIL1-overexpressing, knockout, and wild-type rice plants under light and dark conditions.
  • Transcriptomic (RNA-seq), proteomic (IP-MS), and protein interaction (Co-IP) analyses.
  • Assessment of blast disease symptoms, defense gene expression, and phytohormone levels.

Main Results:

  • Darkness pre-treatment enhanced resistance in OsPIL1 OE plants, while light pre-treatment compromised it.
  • OsPIL1 knockout plants showed increased susceptibility, particularly under light, confirming OsPIL1 as a light-dependent negative regulator of immunity.
  • OsPIL1 interacts with cell wall invertase OsINV3, potentially modulating sugar signaling and contributing to resistance.

Conclusions:

  • OsPIL1 acts as a key signaling hub that negatively regulates rice immunity in a light-dependent manner.
  • The interaction between OsPIL1 and OsINV3 plays a role in maintaining partial resistance in darkness.
  • Findings offer potential targets for improving rice disease resistance through breeding or agronomic strategies.