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United States Department of Agriculture

Agricultural Research Service

Research Project: CONTROL OF RUSTS OF CEREAL CROPS

Location: Wheat Genetics, Quality Physiology and Disease Research

Title: Virulence diversity of international collections of the wheat stripe rust pathogen, Puccinia striiformis f. sp. tritici

Authors
item Sharma-Poudyal, Dipak -
item CHEN, XIANMING

Submitted to: American Phytopathological Society
Publication Type: Abstract Only
Publication Acceptance Date: April 1, 2011
Publication Date: July 1, 2011
Citation: Sharma-Poudyal, D., Chen, X. 2011. Virulence diversity of international collections of the wheat stripe rust pathogen, Puccinia striiformis f. sp. tritici. American Phytopathological Society. 101:5164.

Interpretive Summary: Virulence information in the wheat stripe rust pathogen is important for controlling the disease with resistant cultivars. A total of 236 isolates from Algeria, Australia, Canada, Chile, China, Hungary, Kenya, Nepal, Pakistan, Russia, Spain, Turkey, and Uzbekistan were tested on 20 single-gene lines and the 20 wheat genotypes for differentiating U.S. races. Thirty U.S. isolates representing 15 major races in 2006-2009 were selected for comparison. The 236 isolates were identified as 115 races on the single-gene lines and 160 races on the U.S. differentials. None of the isolates were virulent to resistance genes Yr5 and Yr15. Virulence frequencies of other genes were determined for each country and compared among countries. Although races were generally different, most of the virulences were common in these countries. The virulence data indicated gene flow between some of the countries. The results are useful for control of stripe rust through breeding and growing resistant cultivars worldwide.

Technical Abstract: Virulence information in the wheat stripe rust (yellow rust, Yr) pathogen, Puccinia striiformis f. sp. tritici (Pst), is important for controlling the disease with resistant cultivars. A total of 236 Pst isolates from Algeria, Australia, Canada, Chile, China, Hungary, Kenya, Nepal, Pakistan, Russia, Spain, Turkey, and Uzbekistan were tested on 20 single-gene lines and the 20 wheat genotypes for differentiating U.S. races. Thirty U.S. isolates representing 15 major races in 2006-2009 were selected for comparison. The 236 isolates were identified as 115 races on the single-gene lines and 160 races on the U.S. differentials. None of the isolates were virulent to resistance genes Yr5 and Yr15. Virulences to Yr10, Yr24, Yr32, YrSP and Moro (Yr10,YrMor) were low (<20%); those to YrA, Yr2, Yr6, Yr7, Yr17, Yr26, Yr31, YrExp2, Yr21, Produra (YrPr1,YrPr2), Stephens (Yr3a, YrS,YrSte), Lee (Yr7,Yr22,Yr23) and Fielder (Yr6,Yr20) were high (>80%); and those to Yr1, Yr8, Yr9, Yr25, Yr27, Yr28, Heines VII (Yr2,YrHVII), Paha (YrPa1,YrPa2,YrPa3), Druchamp (Yr3a,YrD,YrDru), Yamhill (Yr2,Yr4a,YrYam), Tyee (YrTye), Tres (YrTr1,YrTr2), Hyak (Yr17,YrTye), Express (YrExp1,YrExp2), Clement (Yr9,YrCle) and Compair (Yr8,Yr19) were moderately frequent (20-80%). Although races were generally different, most of the virulences were common in these countries. The virulence data indicated gene flow between some of the countries.

Last Modified: 9/29/2014
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