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Updated: Mar 19, 2026

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Multiple Disease Resistance in Plants.

Tyr Wiesner-Hanks1, Rebecca Nelson1

  • 1School of Integrative Plant Science, Cornell University, Ithaca, New York 14853; email: tw372@cornell.edu , rjn7@cornell.edu.

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Summary
This summary is machine-generated.

Plants possess multiple disease resistance (MDR) mechanisms, moving beyond highly specific immunity. This review explores the genetic basis of MDR, offering insights for plant breeders and pathologists.

Keywords:
QTLcrop improvementgenome-wide association analysislinkage analysispleiotropy

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Area of Science:

  • Plant pathology
  • Genetics
  • Plant immunity

Background:

  • Plants exhibit innate immunity, often highly specific to pathogens.
  • Emerging evidence suggests some plant defense components offer broad protection against multiple diseases, termed multiple disease resistance (MDR).
  • Understanding MDR is crucial for plant biology, pathology, and breeding.

Purpose of the Study:

  • To review and synthesize current evidence supporting the MDR hypothesis.
  • To examine MDR through the framework of forward genetics, from organism to gene level.
  • To consolidate knowledge on the genetic and molecular underpinnings of MDR.

Main Methods:

  • Review of existing literature on plant disease resistance.
  • Analysis of MDR through forward genetics approaches.
  • Examination of genetic loci and gene mechanisms conferring MDR.

Main Results:

  • MDR can be controlled by various genetic architectures, including R gene clusters, dispersed genes, and single genes.
  • Well-characterized MDR loci reveal diverse mechanisms at both locus and gene levels.
  • Evidence supports that plant defense is not solely based on specific pathogen recognition.

Conclusions:

  • MDR is a significant aspect of plant innate immunity, complementing specific resistance.
  • The genetic control of MDR is complex and multifaceted, involving various gene types and arrangements.
  • Further research into MDR mechanisms can inform the development of disease-resistant crops.