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ARS Home » Southeast Area » Stuttgart, Arkansas » Dale Bumpers National Rice Research Center » Research » Publications at this Location » Publication #301036
Title: Disease reactions of IRRI near-isogenic rice lines to U.S. isolates of Magnaporthe oryzae

Author
item FENG, CHUNDA - University Of Arkansas
item ROTICH, FELIX - University Of Arkansas
item Jia, Yulin
item CORRELL, JAMES - University Of Arkansas

Submitted to: Rice Technical Working Group Meeting Proceedings
Publication Type: Proceedings
Publication Acceptance Date: 2/18/2014
Publication Date: 12/15/2014
Citation: Feng, C., Rotich, F., Jia, Y., Correll, J. 2014. Disease reactions of IRRI near-isogenic rice lines to U.S. isolates of Magnaporthe oryzae. Proc. 35th Rice Tech. Work. Group Meet., New Orleans, LA, p.89. Feb 18-21, 2014. CDROM.

Interpretive Summary:

Technical Abstract: Rice blast, caused by Magnaporthe oryzae, is a destructive disease of rice. The use of resistant cultivars is the most effective way to manage this disease. However, to be effective, it is necessary to know how the isolates of the pathogen within a population respond to specific resistance genes. Two sets of near-isogenic lines (NILs), each containing a target resistant gene, in either a Japonica cultivar (Lijiangxintuanheigu -LTH) or an Indica cultivar (CO39) background, have been developed by IRRI. Twelve U.S. reference isolates were tested on 31 LTH NILs and 20 CO39 NILs containing 25 targeted resistance genes. NILs containing genes Pia and Pi3(t) were susceptible to all reference isolates tested whereas NILs containing Pi9(t) or Pi12(t) were resistant to all isolates. Lines containing genes Pib, Pi11(t), and Pita-2 were resistant to nine or 10 isolates. Four loci provided resistance to reference isolate 49D (race IB-49) or IB33 (race IB-33), seven loci provided resistance to isolate TM2 (race IE-1k), and 14, 16, and 17 loci provided resistance to isolate IB-54, isolate #24 (race IG-1), and isolate ID-13, respectively. Pi19(t) and Piks were only resistant to one isolate. PiI, Pikh, Pikp were resistant to two isolates and Pi1, Pi7(t), Pik, Pika, Pikm were resistant to 3 isolates. Thus, the five loci, Pi9(t), Pi12(t), Pib, Pi11(t) and Pita-2, were the most effective resistance genes to the panel of reference isolates evaluated and could be exploited to improve resistant to rice blast disease in the U.S.