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Sexually Fertile Magnaporthe grisea Rice Pathogens in Thailand.

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Summary

Magnaporthe grisea sexual fertility and mating types were analyzed in Thailand. Fertile isolates of both mating types were found, with MAT1-2 predominating and male fertility being most common.

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Area of Science:

  • Plant Pathology
  • Mycology
  • Genetics

Background:

  • Magnaporthe grisea is a significant plant pathogen.
  • Understanding its sexual reproduction is crucial for disease management.
  • Previous studies indicated diverse M. grisea populations in Thailand.

Purpose of the Study:

  • To analyze the sexual fertility and mating type distribution of M. grisea field isolates from Thailand.
  • To assess the potential for sexual recombination in Thai M. grisea populations.

Main Methods:

  • Collected 341 single conidium isolates of M. grisea from five sites in Thailand.
  • Evaluated in vitro sexual fertility and mating type by pairing with known tester strains.
  • Determined fertility by perithecia density.

Main Results:

  • 67% of isolates were infertile.
  • Fertile isolates of both mating types (MAT1-1 and MAT1-2) were found in northeastern and northern regions.
  • MAT1-2 mating type predominated.
  • Male fertility was predominant (50-85%), but hermaphroditic/female fertile isolates were also detected.
  • Perithecia density was generally low (<10 cm⁻²).

Conclusions:

  • Sexual reproduction and recombination are possible in M. grisea populations in Thailand.
  • The predominance of MAT1-2 and male fertility suggests potential biases in sexual processes.
  • Further research is needed to understand the implications for disease dynamics.