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Controlling crop diseases using induced resistance: challenges for the future.

Dale R Walters1, Jaan Ratsep, Neil D Havis

  • 1Crop & Soil Systems Research Group, SRUC, West Mains Road, Edinburgh EH9 3JG, UK. dale.walters@sruc.ac.uk

Journal of Experimental Botany
|February 7, 2013
PubMed
Summary

Induced resistance in plants, including systemic acquired resistance and induced systemic resistance, offers broad-spectrum, long-lasting disease reduction. However, environmental factors and crop management significantly influence its effectiveness, requiring further research for practical application.

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Area of Science:

  • Plant pathology
  • Crop protection science
  • Molecular plant-microbe interactions

Background:

  • Induced resistance encompasses various plant defense strategies, such as systemic acquired resistance (SAR) and induced systemic resistance (ISR).
  • These resistance mechanisms can be triggered by diverse biotic and abiotic agents, leading to broad-spectrum and durable, though incomplete, disease control.
  • Current disease reduction rates achieved by inducing agents typically range from 20% to 85%.

Purpose of the Study:

  • To review the current understanding of induced resistance mechanisms in plants.
  • To identify factors influencing the expression of induced resistance under field conditions.
  • To highlight the need for further research on practical applications of induced resistance in crop protection.

Main Methods:

  • Literature review of studies on induced resistance in plants.
  • Analysis of signaling pathways and effectiveness spectra of different induced resistance types.
  • Synthesis of findings on factors affecting induced resistance expression and its practical use.

Main Results:

  • Induced resistance, including SAR and ISR, provides significant but variable disease reduction (20-85%).
  • Expression of induced resistance is complex and influenced by environmental conditions, plant genotype, nutrition, and prior induction status.
  • Understanding of these influencing factors and their impact on field performance remains limited.

Conclusions:

  • Induced resistance is a promising strategy for plant disease management, offering broad-spectrum and lasting protection.
  • Environmental and crop-specific factors critically modulate the efficacy of induced resistance, necessitating context-specific approaches.
  • Further research is essential to optimize the integration of induced resistance into sustainable crop protection programs.