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ARS Home » Southeast Area » Stuttgart, Arkansas » Dale Bumpers National Rice Research Center » Research » Publications at this Location » Publication #324683

Title: Analysis of rice blast avirulence genes in field blast isolates in the southern USA from 1950-2015

item WANG, XUEYAN - University Of Arkansas
item Bianco, Tracy
item WAMISHE, YESHI - University Of Arkansas
item VALENT, BARBARA - Kansas State University
item Jia, Yulin

Submitted to: Rice Technical Working Group Meeting Proceedings
Publication Type: Proceedings
Publication Acceptance Date: 12/23/2015
Publication Date: 7/2/2017
Citation: Wang, X., Bianco, T.A., Wamishe, Y., Valent, B., Jia, Y. 2017. Analysis of rice blast avirulence genes in field blast isolates in the southern USA from 1950-2015. Proc. 36th Rice Technical Working Group Meeting Proceedings, Galveston, TX. pg. 100. March 1-4, 2016. CDROM.

Interpretive Summary:

Technical Abstract: The avirulence genes in Maganporthe oryzae determine the efficacies of resistance (R) genes in rice. Understanding the dynamics of AVR genes is useful in determining the stability of the effective resistance genes in rice cultivars. A total of 859 rice blast field isolates collected from the southern USA from 1959 to 2015 were investigated. The presence and/or absence of AVR genes were verified using PCR with gene specific DNA primers. The percentages for AVR-Pib, AVR-Pi9, ACE1(AVR-Pi33), AVR-Pizt, AVR-Pita1, and AVR-Pik were 97%, 96%, 92%, 87%, 87%, and 38%, respectively. These findings suggest that Pib, Pi9, Pi33, Piz, and Pi-ta are stable R genes to protect against rice blast disease in the southern USA. The reliability of this prediction will be validated with IRRI monogenic lines carrying corresponding R genes and our progress will be reported.