Skip to main content
ARS Home » Pacific West Area » Pullman, Washington » WHGQ » Research » Publications at this Location » Publication #413773
Research Project: Enhancing Control of Stripe Rusts of Cereal Crops

Location: Wheat Health, Genetics, and Quality Research

Title: Virulence characterization of Puccinia striiformis causing stripe rusts on wheat and barley in the United States in 2023

Author
item WANG, MEINAN - Washington State University
item Chen, Xianming

Submitted to: American Phytopathological Society Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 6/1/2024
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: Wheat stripe rust, caused by Puccinia striiformis f. sp. tritici (Pst), and barley stripe rust, caused by P. striiformis f. sp. hordei (Psh), are important diseases in the United States. To monitor virulence changes and race compositions of the pathogens, 257 Pst isolates were obtained from 13 states and 27 Psh isolates from 4 states in 2023. The Pst isolates were tested on 18 wheat Yr single-gene differentials and the Psh isolates on 12 barley cultivar differentials. The virulence frequencies were low for YrSP (6.2%), Yr76 (7.4%), Yr24 (8.2%), Yr32 (8.2%), Yr1 (13.2%), and Yr10 (16.3%); and high for YrYr27 (88.3%), YrTr1 (90.7%), Yr17 (90.7%), Yr43 (93.0%), YrExp2 (93.4%), Yr44 (93.4%), Yr7 (93.4%), Yr8 (94.2%), Yr6 (98.4%), and Yr9 (98.8%). No isolates were virulent to Yr5 and Yr15. Of 21 Pst races identified, PSTv-37 (59.5%) was the most predominant, followed by PSTv-39 (7.0%), PSTv-41 (6.6%), PSTv-47 (6.2%), and PSTv-35 (4.3%). PSTV-37 was detected across all states except California, and other races were mainly from the western states. From 27 Psh isolates, five races were identified. The predominant race was PSH-33 (40.7%) with virulence factors to Topper and Abed Binder 12, followed by PSH-81 (29.6%) and PSH-46 (18.5%) with additional virulence factors to Bigo and Trumpf, respectively. PSH-33 was detected from all four states and the other races were only from Washington. These results should be useful in breeding wheat and barley cultivars for resistance to stripe rust and managing the disease.