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A Single Effector Protein, AvrRpt2

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The Erwinia amylovora effector protein AvrRpt2EA causes fire blight symptoms in susceptible apples. Its expression activates salicylic acid (SA) defenses and induces systemic acquired resistance (SAR).

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Area of Science:

  • Plant Pathology
  • Molecular Plant-Microbe Interactions
  • Plant Defense Signaling

Background:

  • The AvrRpt2EA effector protein from Erwinia amylovora is crucial for pathogen recognition in resistant crabapples.
  • Its function in susceptible apple cultivars remains largely uncharacterized.

Purpose of the Study:

  • To investigate the role of AvrRpt2EA in planta within susceptible apple cultivars.
  • To elucidate the defense signaling pathways activated by AvrRpt2EA.

Main Methods:

  • Generation of transgenic apple plants (cv. Pinova) expressing a heat-inducible AvrRpt2EA.
  • Analysis of plant defense responses, including gene expression (PR-1, VSP2) and hormone levels (salicylic acid, jasmonic acid).

Main Results:

  • Induced AvrRpt2EA expression in transgenic apples mimicked fire blight symptoms (shoot necrosis, leaf browning).
  • AvrRpt2EA significantly increased salicylic acid (SA) levels and the expression of SA-responsive genes (PR-1).
  • Jasmonic acid (JA)-dependent defense pathways were not activated by AvrRpt2EA.

Conclusions:

  • AvrRpt2EA functions as a virulence factor in susceptible apples.
  • AvrRpt2EA induces SA-mediated defense responses and systemic acquired resistance (SAR).