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Diversity and Distribution of Rice Blast (Pyricularia oryzae Cavara) Races in Japan.

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Area of Science:

  • Plant Pathology
  • Genetics
  • Agricultural Science

Background:

  • Rice blast, caused by Pyricularia oryzae Cavara, is a major threat to global rice production (Oryza sativa L.).
  • Understanding the genetic diversity and virulence of pathogen populations is crucial for effective disease management strategies.

Purpose of the Study:

  • To analyze the virulence variation of Pyricularia oryzae Cavara isolates collected from Japan.
  • To classify these isolates into distinct groups based on their pathogenicity profiles against rice differential varieties (DV).
  • To assess the overall diversity of rice blast races in Japan.

Main Methods:

  • Inoculation of 310 Pyricularia oryzae Cavara isolates onto rice differential varieties (DV) with known resistance genes.
  • Virulence assessment based on infection patterns.
  • Cluster analysis of isolate reaction patterns to classify virulence groups.
  • Development of a new designation system for race classification.

Main Results:

  • Significant variation in virulence was observed among the 310 isolates.
  • Isolates showed high virulence on DVs with resistance genes Pish, Pia, Pii, Pi3, Pi5(t), Pik-s, and Pi19(t) (82.9–100.0%).
  • Conversely, low virulence was noted on DVs with Pib, Pit, Pik-m, Pi1, Pik-h, Pik, Pik-p, Pi7(t), Pi9(t), Piz, Piz-5, Piz-t, Pita-2, Pita, Pi12(t), and Pi20(t) (0–21.6%).
  • Cluster analysis identified three main groups (I, IIa, IIb) with distinct virulence profiles and geographical distributions.
  • Group IIa, distributed throughout Japan, is hypothesized to be the original population.
  • 123 distinct races were identified using a new designation system.

Conclusions:

  • The study reveals significant virulence variation in Japanese Pyricularia oryzae Cavara isolates.
  • Geographical distribution of virulence groups suggests localized adaptations.
  • The findings indicate that rice blast races in Japan are less diverse than previously assumed.
  • The proposed classification system aids in understanding and managing rice blast populations.