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Recombination in Magnaporthe grisea.

R S Zeigler1

  • 1Entomology and Plant Pathology Division, International Rice Research Institute, Manila, Philippines. r.zeigler@cgnet.com

Annual Review of Phytopathology
|March 12, 2004
PubMed
Summary

Magnaporthe grisea, the rice blast pathogen, is primarily asexual in most populations. However, sexual reproduction occurs in some Asian regions, suggesting potential loss of fertility in agricultural settings.

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Area of Science:

  • Plant pathology
  • Fungal genetics
  • Agricultural microbiology

Background:

  • Magnaporthe grisea is the causal agent of rice blast, affecting numerous grass species.
  • The pathogen exhibits potential for both sexual and asexual reproduction.
  • Most populations appear to be asexual, with limited genetic exchange.

Purpose of the Study:

  • To investigate the reproductive strategies of Magnaporthe grisea.
  • To understand the factors influencing sexual and asexual reproduction in rice blast populations.
  • To explore the genetic diversity and potential for recombination in this pathogen.

Main Methods:

  • Mating type analysis
  • Fertility assays
  • Genotypic diversity assessment
  • Analysis of chromosome length polymorphisms and translocations

Main Results:

  • Most Magnaporthe grisea populations are predominantly asexual.
  • Parasexual recombination cannot be excluded as a possibility.
  • Genetic isolation exists between pathogens of different grass hosts, with some gene flow.
  • Sexual fertility is observed in rice pathogens from South and East Asian mountainous areas.

Conclusions:

  • While largely asexual, Magnaporthe grisea retains the capacity for sexual reproduction in specific geographic regions.
  • Factors such as chromosomal abnormalities may impede meiosis in certain populations.
  • Agricultural practices may contribute to the loss of sexual fertility in this important plant pathogen.

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