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The Plant Infection Test: Spray and Wound-Mediated Inoculation with the Plant Pathogen Magnaporthe Grisea
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Host species-specific repetitive DNA sequence in the genome of Magnaporthe grisea, the rice blast fungus

T Sone1, M Suto, F Tomita

  • 1Department of Bioscience and Chemistry, Faculty of Agriculture, Hokkaido University, Sapporo, Japan.

Bioscience, Biotechnology, and Biochemistry
|July 1, 1993
PubMed

Insights

Researchers identified a repetitive DNA sequence, MGSR1, in the rice blast fungus Magnaporthe grisea. This sequence reveals genetic variations, helping distinguish between fungal lineages that infect rice.

Area of Science:

  • Molecular Biology
  • Mycology
  • Genetics

Background:

  • Magnaporthe grisea is a significant fungal pathogen causing rice blast, a major threat to global food security.
  • Understanding the genetic diversity within M. grisea is crucial for developing effective disease management strategies.

Purpose of the Study:

  • To identify and characterize repetitive DNA sequences in the Magnaporthe grisea genome.
  • To utilize these sequences for detecting genetic polymorphisms and differentiating between pathogenic isolates.

Main Methods:

  • Cloning of a dispersed, 0.8 kb repetitive sequence, designated MGSR1 (Magnaporthe grisea short repeat 1).
  • Analysis of MGSR1 conservation across various fungal pathogens.
  • Application of restriction fragment length polymorphisms (RFLPs) using MGSR1 to analyze isolate genomes.

Main Results:

  • MGSR1 exhibited high conservation in rice-pathogenic M. grisea but low conservation in pathogens of other grasses.
  • RFLPs generated by MGSR1 effectively distinguished between clonal lineages within rice-pathogenic isolates.
  • The MGSR1 sequence contains an internal RNA polymerase III promoter, a 3'-poly(T) tail, and an 8-bp direct repeat.

Conclusions:

  • MGSR1 is a valuable molecular marker for studying the population genetics of Magnaporthe grisea.
  • The sequence's specificity to rice pathogens aids in understanding host-pathogen interactions and evolutionary relationships.

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