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ARS Home » Southeast Area » Stuttgart, Arkansas » Dale Bumpers National Rice Research Center » Research » Publications at this Location » Publication #403739
Research Project: Gene Discovery and Crop Design for Current and New Rice Management Practices and Market Opportunities

Location: Dale Bumpers National Rice Research Center

Title: An efficient method for screening rice breeding lines against races of Magnaporthe oryzae

Author
item BUDOT, BERNARD - Louisiana State University Agcenter
item MAKAGKIL, J - University Of The Philippines Los Banos
item LANA, FELIPE - University Of The Philippines Los Banos
item ANGIRE, BRIJESH - University Of The Philippines Los Banos
item FAMOSO, ADAM - Louisiana State University Agcenter
item Jia, Yulin
item OLIVEIRA-GARCIA, ELY - Louisiana State University Agcenter

Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: 5/7/2023
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: Rice blast, caused by the ascomycete fungus Magnaporthe oryzae, is the most destructive disease of rice worldwide. Rice breeding programs rely on field screenings to determine the resistance levels of breeding lines. However, the blast fungus rapidly differentiates into races which enables it to break the resistance of major deployed resistance genes. Therefore, the screening of breeding lines against major blast races is essential to achieve durable blast resistance. Here, we develop a 0-6 scale for blast disease that allows the assignment of rice breeding lines and varieties into six resistance levels (highly resistant, resistant, moderate resistant, moderate susceptible, susceptible, highly susceptible). We evaluated approximately 40 common rice varieties against four major blast races (IB1, IB17, IB49, and IE1-K). Varieties carrying the Pita gene were either highly resistant, resistant, or moderate resistant to IB17. IE1-K race was able to break the Pita-mediate resistance of the rice varieties. The Piz gene conferred resistance to the IB17 and IE1-K races. The varieties Caffey, CL111, ZHE, and IR9660 were resistant to the four blast races. Moreover, varieties that were resistant or susceptible to all four blast races also showed similar levels of resistance/susceptibility to blast disease in the field. Taken together, our data proved that the 0-6 blast scale can efficiently determine the resistance levels of rice varieties against major blast races. This robust method will assist rice breeding programs to incorporate durable resistance against major and emerging blast races.