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Poster

Session: Session 2 Presenting Authors at Posters (Odds)

P-055 - Identification of a genetic factor supporting Rmg8-dependent resistance to wheat

Wednesday, July 16, 2025
13:30 - 15:15  
Location: Confex Hall 3
Crop resistance genetics and genomics

    Presenting Author(s)

  • RM

    Reo Maeda

    Graduate School of Agricultural Science, Kobe University
    Kobe-Shi, Japan, JAPAN

    • Author(s)

  • YT

    Yukio Tosa

    Graduate School of Agricultural Science, Kobe University
    Kobe, Hyogo, Japan

  • SA

    Soichiro Asuke

    Graduate School of Agricultural Science, Kobe University
    Kobe, JAPAN

Wheat blast, caused by Pyricularia oryzae pathotype Triticum (MoT), has become a significant threat to global wheat production. It was first reported in Brazil in 1985 and spread to regions with relatively high temperature. A simulation study predicts that vulnerable areas to wheat blast will increase due to global warming. Thus, developing wheat cultivars with effective resistance under high temperature conditions is crucial. In this study, we identified a genetic factor that supports Rmg8-dependent resistance even at high temperature. Rmg8is a wheat resistance gene isolated from the common wheat cultivar S-615, and recognizes its corresponding avirulence gene, AVR-Rmg8. We evaluated the effectiveness of Rmg8 and its variants in 26 wheat landraces carrying Rmg8. IL191, one of the Rmg8 carriers, showed strong resistance to Br48 (MoT isolate) even at 30℃, whereas S-615 was susceptible. IL191 was susceptible to Br48ΔA8, an AVR-Rmg8 disruptant of Br48, suggesting that its resistance is Rmg8-dependent. When F2 seedlings derived from a cross between IL191 and S-615 were inoculated with Br48 under high temperature, resistant and susceptible individuals segregated clearly in a 3:1 ratio. However, all F2 seedlings carried Rmg8, indicating that another single gene supports the resistance under the high-temperature condition. A QTL-seq analysis suggested that the causative gene is located on chromosome 2D.