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Resistance gene complexes: evolution and utilization.

S H Hulbert¹, C A Webb, S M Smith

¹Department of Plant Pathology, Kansas State University, Manhattan, Kansas 66506, USA. shulbrt@plantpath.ksu.edu

Annual Review of Phytopathology

|November 10, 2001

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Plant resistance (R) genes protect against pathogens and pests. Understanding R gene evolution and function is key to developing durable disease resistance in crops.

Area of Science:

Plant genetics
Molecular biology
Crop protection

Background:

Over 30 plant resistance (R) genes identified across species confer resistance to diverse pathogens and pests.
R gene structures suggest roles in pathogen recognition and defense signaling pathways.
R genes are abundant in plant genomes, often organized in tightly linked gene families.

Purpose of the Study:

To review the characteristics and evolution of plant resistance (R) genes.
To explore the mechanisms underlying R gene function in plant defense.
To discuss future strategies for utilizing R genes in crop improvement.

Main Methods:

Literature review of characterized plant resistance genes.
Analysis of R gene structure-function relationships.

Related Experiment Videos

Examination of evolutionary dynamics of R gene families.

Main Results:

R genes are crucial for plant immunity, recognizing pathogen effectors (avr gene products).
Evolutionary selection favors R gene alleles and haplotypes that balance pathogen recognition with minimal physiological cost.
R gene evolution is shaped by mutation, recombination, and selection pressures from pathogen populations.

Conclusions:

Future R gene applications include inter-generic transfer and engineering for durable resistance.
Durable resistance may involve interactions with conserved pathogen elicitors or Avr gene-independent defense pathways.