Location: Small Grains and Potato Germplasm Research
Project Number: 2050-21000-038-019-S
Project Type: Non-Assistance Cooperative Agreement
Start Date: Jul 1, 2023
End Date: Jun 30, 2025
Objective:
Discover, characterize, develop, and deploy effective resistance against barley stripe rust (BSR) (incited by Puccinia striiformis f. sp. hordei), scald (incited by Rhynchosporium commune), and Barley Yellow Dwarf Virus (BYDV) to protect U.S. barley production by: 1) evaluation of elite cultivated barley germplasm; 2) evaluation of barley wild relatives held by the National Small Grains Collection.
Approach:
Test germplasm for stripe rust and scald at Corvallis, OR using a set of materials, phenotyping protocols, and experimental designs that are also used in Davis, CA and Mt. Vernon, WA disease nurseries. This will facilitate comparison of results across the region. Phenotyping will be done in single-row plots using procedures that are standard at each location. Susceptible spreader rows composed of susceptible varieties, and artificial inoculation (if warranted) will be used to facilitate infection. Minimum data: barley stripe and scald rust severity at one assessment date, heading date, other diseases. Disease samples will be sent to the USDA-ARS Pullman lab for stripe rust race identification. Several categories of germplasm will be evaluated: (A) PNW BSR screening trial: This nursery, including checks, will consist of ~ 40 entries composed of mixture of new and previously tested entries from California, Idaho, Oregon, and Washington public breeding programs, resistant and susceptible checks, and a set of differentials. This trial will be grown at each location using a minimum of three replicates. (B) Uncharacterized wild and cultivated barley accessions selected from the National Small Grains Collection: These nurseries will be used to identify potential new sources of resistance to stripe rust and scald. Promising accessions will be used as parents to develop new populations. (C) Novel germplasm/population screening: These nurseries, consisting of GWAS panels and/or biparental populations, will be used to elucidate the genetics of resistance, with an emphasis on BYDV but taking advantage of barley stripe rust and scald epidemics, if these occur. The materials will be assessed using a Type II augmented designs or a replicated complete block design. Data and analyses will be posted at http://barleyworld.org/barley-stripe-rust-bsr. When sufficient data are generated, manuscripts will be submitted for publication in peer-reviewed journals.
