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

• DOI: 10.1094/pdis-04-15-0442-re
• Publication Date: 2015-12-04T19:32:31Z
• Authors: A. Kawasaki-Tanaka; N. Hayashi; S. Yanagihara; Y. Fukuta
• Keywords: Pyricularia

In total, 310 rice blast (Pyricularia oryzae Cavara) isolates from Japan showed wide variation in virulence. Virulence on (Oryza sativa L.) differential varieties (DV) harboring resistance genes Pish, Pia, Pii, Pi3, Pi5(t), Pik-s, and Pi19(t) ranged 82.9 to 100.0%. contrast, virulence DV possessing Pib, Pit, Pik-m, Pi1, Pik-h, Pik, Pik-p, Pi7(t), Pi9(t), Piz, Piz-5, Piz-t, Pita-2, Pita, Pi12(t), Pi20(t) 0 21.6%. Cluster analysis using the reaction patterns of classified into three groups: I, virulent Pi7(t); IIa, avirulent preceding 6 Pi5(t); IIb, all 10 genes. Group I was limited northern group IIb central Japan, while IIa distributed throughout Japan. We estimate that represents original population groups arose it through minor changes pathogenicity. these 123 races by a new designation system conclude are less diverse than previously thought.