Origin and Dynamics of Rwt6, a Wheat Gene for Resistance to Nonadapted Pathotypes of Pyricularia oryzae

Soichiro Asuke, Yuta Umehara, Yoshihiro Inoue, Trinh Thi Phuong Vy, Mizuki Iwakawa, Yoshihiro Matsuoka, Kenji Kato, Yukio Tosa

Research output: Contribution to journalArticlepeer-review

Abstract

Avirulence of Eleusine isolates of Pyricularia oryzae on common wheat is conditioned by at least five avirulence genes. One is PWT3 corresponding to resistance gene Rwt3 located on chromosome 1D. We identified a resistance gene corresponding to a second avirulence gene, PWT6, and named it Rmg9 (Rwt6). Rwt6 was closely linked to Rwt3. A survey of the population of Aegilops tauschii, the D genome donor to common wheat, revealed that some accessions from the southern coastal region of the Caspian Sea, the birthplace of common wheat, carried both genes. Rwt6 and Rwt3 carriers accounted for 65 and 80%, respectively, of accessions in a common wheat landrace collection. The most likely explanation of our results is that both resistance genes were simultaneously introduced into common wheat at the time of hybridization of Triticum turgidum and A. tauschii. However, a prominent difference was recognized in their geographical distributions in modern wheat; Rwt3 and Rwt6 co-occurred at high frequencies in regions to the east of the Caspian Sea, whereas Rwt6 occurred at a lower frequency than Rwt3 in regions to the west. This difference was considered to be associated with range of pathotypes to which these genes were effective. A. tauschii accessions carrying Rwt3 and Rwt6 also carried Rwt4, another resistance gene involved in the species specificity. We suggest that the gain of the D genome should have given an adaptive advantage to the genus Triticum by conferring disease resistance.

Original languageEnglish
Pages (from-to)2023-2029
Number of pages7
JournalPhytopathology
Volume111
Issue number11
DOIs
Publication statusPublished - Nov 2021

Keywords

  • Aegilops tauschii
  • Avirulence gene
  • Blast
  • Common wheat
  • Disease resistance
  • Genetics
  • Resistance gene

ASJC Scopus subject areas

  • Agronomy and Crop Science
  • Plant Science

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