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Diagnostic kit for rice blight resistance.

Joon-Seob Eom1,2, Dangping Luo3, Genelou Atienza-Grande4,5

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|October 30, 2019
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Summary

This study introduces a diagnostic kit for analyzing bacterial blight in rice, aiding in the selection of resistant crop lines. It leverages SWEET gene interactions and TAL effectors to combat Xanthomonas oryzae pv. oryzae (Xoo).

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Area of Science:

  • Plant Pathology
  • Molecular Genetics
  • Agricultural Science

Background:

  • Bacterial blight, caused by Xanthomonas oryzae pv. oryzae (Xoo), is a major threat to rice production.
  • SWEET genes act as susceptibility factors, with their induction by bacterial TAL effectors leading to disease.
  • Resistance can be achieved by altering effector-binding elements (EBEs) in SWEET gene promoters to prevent TAL effector recognition.

Purpose of the Study:

  • To develop a comprehensive diagnostic kit for field analysis of bacterial blight.
  • To identify and provide effective blight-resistant rice lines for farmers.
  • To elucidate bacterial virulence mechanisms and SWEET gene interactions.

Main Methods:

  • Development of a SWEET promoter database and RT-PCR primers for SWEET gene induction detection.
  • Creation of engineered reporter and knock-out rice lines for visualizing SWEET protein accumulation and identifying virulence factors.
  • Utilizing CRISPR-Cas9 genome editing to assess EBE mutation efficacy and developing predictive software for optimal resistance gene selection.

Main Results:

  • A diagnostic kit enabling field analysis of bacterial blight and identification of resistant rice lines.
  • Engineered rice lines for visualizing SWEET gene induction and identifying bacterial virulence factors.
  • CRISPR-Cas9 edited rice lines demonstrating the efficacy of EBE mutations for resistance.

Conclusions:

  • The developed diagnostic kit and resistant rice lines offer practical solutions for managing bacterial blight.
  • Understanding SWEET gene regulation by TAL effectors is crucial for developing durable resistance strategies.
  • This work empowers farmers with tools to select appropriate resistant rice varieties, enhancing crop security.