Submitted to: APS Annual Meeting
Publication Type: Abstract Only
Publication Acceptance Date: 6/20/2013
Publication Date: 7/1/2013
Publication URL: https://www.apsnet.org/meetings/Documents/2013_Meeting_Abstracts/aps2013abP278.htm
Citation: Rotich, F., Feng, C., Jia, Y., Correll, J. 2013. Characterizing virulence phenotypes among U.S. isolates of Pyricularia oryzae using IRRI NILs, U.S. germplasm, and NERICA lines. APS Annual Meeting. Aug. 10-14 Austin, TX Abstract #278. Interpretive Summary:
Technical Abstract: Rice blast disease, caused by Pyricularia oryzae, (not Magnaporthea? ) is a major constraint to rice yield in most rice production areas, including the Southeast U.S. In continued efforts to evaluate the effectiveness of resistance genes, a collection of U.S. isolates of P. oryzae were evaluated for virulence using 25 to 40 U.S. rice differentials and two sets of differentials developed by IRRI. The first set comprised 31 monogenic lines with 24 resistance genes and, the second set had 20 lines with 14 resistance genes. In addition, four NERICA cultivars from West Africa were evaluated. A total of 12 different U.S. reference blast races and a collection of field isolates representative of the genetic diversity in the southern U.S. population were evaluated on the rice lines. The set of IRRI differential lines discriminated the isolates into groups different from those based on the U.S. differentials. Two NERICA lines were resistant to all the isolates that were evaluated. NERICA lines did not help in virulence discrimination among the isolates evaluated. However, the resistance genes in these lines could be exploited as potential new sources of resistance to rice blast in the U.S. Future efforts continue to focus on fully characterizing additional field isolates to determine which can overcome specific resistance genes.