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ARS Home » Pacific West Area » Pullman, Washington » WHGQ » Research » Publications at this Location » Publication #390445
Research Project: Improving Control of Stripe Rusts of Wheat and Barley through Characterization of Pathogen Populations and Enhancement of Host Resistance

Location: Wheat Health, Genetics, and Quality Research

Title: Changes of barley stripe rust populations in the Unites States from 1993 to 2017

Author
item BAI, QING - Washington State University
item LIU, TINGLAN - Washington State University
item WAN, ANMIN - Washington State University
item WANG, MEINAN - Washington State University
item See, Deven
item Chen, Xianming

Submitted to: Phytopathology
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 6/7/2022
Publication Date: 6/22/2022
Citation: Bai, Q., Liu, T., Wan, A., Wang, M., See, D.R., Chen, X. 2022. Changes of barley stripe rust populations in the Unites States from 1993 to 2017. Phytopathology. https://doi.org/10.1094/PHYTO-04-22-0135-R.
DOI: https://doi.org/10.1094/PHYTO-04-22-0135-R

Interpretive Summary: Barley stripe rust is a relatively new disease in the United States. The pathogen was first observed in Texas in 1991 and has spread north and westwards and mainly caused epidemics in the western United States. To study the long-term dynamics, diversity, and differentiation of the U.S. population of the barley stripe rust pathogen, 447 isolates collected from 1993 to 2017 were identified as 382 multi-locus genotypes (MLGs) using 14 simple sequence repeat markers. The heterozygosity and genotypic diversity of the population increased in recent years. The MLGs were clustered into six molecular groups (MGs) using the hierarchical cluster analysis, and the MGs had significant differences in frequency in different periods. MG1 was present in the population prior to the year 2000. MG2, MG3, and MG4 became predominate after 2000. MG5 was detected in all 25 years but in higher percentages since 2010. MG6 was the most recent group detected only since 2012. The pathogen population changed rapidly from year to year, with significant changes around 2000 and 2010. These results are useful for understanding the pathogen evolution and for managing stripe rust on barley.

Technical Abstract: Barley stripe rust is a relatively new disease in the United States. The pathogen, Puccinia striiformis Westend. f. sp. hordei Erikss. (Psh), was first observed in Texas in 1991 and has spread north and westwards and mainly caused epidemics in the western United States. To study the long-term dynamics, diversity, and differentiation of the U.S. Psh population, 447 isolates collected from 1993 to 2017 were identified as 382 multi-locus genotypes (MLGs) using 14 simple sequence repeat markers. The heterozygosity and genotypic diversity of the population increased in recent years. The MLGs were clustered into six molecular groups (MGs) using the hierarchical cluster analysis, and the MGs had significant differences in frequency in different periods. MG1 was present in the population prior to the year 2000. MG2, MG3, and MG4 became predominate after 2000. MG5 was detected in all 25 years but in higher percentages since 2010. MG6 was the most recent group detected only since 2012. The Psh population changed rapidly from year to year, with significant changes around 2000 and 2010. These results are useful for understanding the pathogen evolution and for managing stripe rust on barley.