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ARS Home » Southeast Area » Stuttgart, Arkansas » Dale Bumpers National Rice Research Center » Research » Publications at this Location » Publication #400463
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: Blast panel investigation of disease resistance of high yielding breeding lines

Author
item Box, Heather
item Jia, Yulin
item WANG, X - University Of Arkansas
item WAMISHE, YESHI - University Of Arkansas
item Jia, Melissa

Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: 1/11/2023
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: Rice blast disease caused by the fungus Magnaporthe oryzae (syn. M. grisea) is one of the most lethal diseases for sustainable rice production worldwide. Major blast resistance (R) genes have been used singularly, once at a time or in combination that provides overlapped resistance to a wide range of blast races. In the USA, major blast R gene Pi-ta, Ptr (previously named as Pi-ta2), Pi-b, Pi-z, Pi-k have been effectively deployed over decades using classical plant breeding added with closely linked genetic markers or markers derived from portions of cloned genes. The efficacy of major R genes is determined by the corresponding avirulence genes (AVR) in M. oryzae. AVR genes in M. oryzae are highly mutable under changing climate and deployed R genes. Therefore, continued characterization and evaluation of AVR genes in M. oryzae can guide R gene deployment. Thus far, a panel of blast races consisting of 12 isolates were identified from diseased samples since 2015 based on AVR gene composition and pathogenicity assays using IRRI monogenic lines carrying 23 major blast R genes. This blast panel has been used to verify function of deployed R genes in advanced breeding lines developed by ARS, university and industry scientists including 50 lines from the Uniform Regional Rice Nursery (URRN) under greenhouse conditions, and results will be presented.