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ARS Home » Midwest Area » St. Paul, Minnesota » Cereal Disease Lab » Research » Publications at this Location » Publication #404401
Research Project: Surveillance, Pathogen Biology, and Host Resistance of Cereal Rusts

Location: Cereal Disease Lab

Title: Registration of CDL-111 and CDL-167 oat germplasm lines with pyramided adult plant crown rust resistance

Author
item NAZARENO, ERIC - University Of Minnesota
item Caspers, Roger
item CAFFE, MELANIE - South Dakota State University
item SMITH, KEVIN - University Of Minnesota
item RINES, HOWARD - University Of Minnesota
item Kianian, Shahryar

Submitted to: Journal of Plant Registrations
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 2/26/2024
Publication Date: 5/1/2024
Citation: Nazareno, E.S., Caspers, R.A., Caffe, M., Smith, K., Rines, H.W., Kianian, S. 2024. Registration of CDL-111 and CDL-167 oat germplasm lines with pyramided adult plant crown rust resistance. Journal of Plant Registrations. 18(2):410-414. https://doi.org/10.1002/plr2.20372.
DOI: https://doi.org/10.1002/plr2.20372

Interpretive Summary: Oat crown rust is a devastating disease caused by Puccinia coronata f. sp. avenae. The pathogen has high evolutionary potential and can generate new virulences through mutations, meiotic recombination, and reassortment of virulence factors with the aid of its alternate host, common buckthorn (Rhamnus cathartica). Losses due to the disease could reach up to 50%. Breeding for disease resistance is considered to be the most economical and sustainable means to manage the disease. However, race-specific qualitative resistance controlled by major genes is easily overcome by the pathogen and has a lifespan of less than five years in the field. Adult plant resistance conditioned by genes with quantitative effects may provide durable resistance, particularly when combined in a single cultivar. Additionally, APR may have a resistance mechanism different from race-specific resistance that would impose less selection pressure on the pathogen. In here we report the release of CDL-111 and CDL-167, both containing three APR QTL, were selected as germplasm for resistance breeding. High-throughput markers for selection were developed and implemented in pyramiding the APR loci.

Technical Abstract: Oat production worldwide is challenged by crown rust (Puccinia coronata f. sp. avenae), which can cause significant yield losses. The disease is often controlled by spraying fungicides or planting resistant varieties. Developing host resistance, however, is a challenge due to the high genetic variability of the pathogen. Race-specific resistance usually succumbs to new races in just a few years. As such, the USDA-ARS Cereal Disease Laboratory (CDL) developed mapping populations to identify adult plant resistance (APR) loci from Avena sativa donors. Resistant lines from the mapping populations were selected and crossed with BT1020-1-1 and BT1021-1-1, which possess a different gene for crown rust resistance derived from A. strigosa. From the crosses, CDL-111 and CDL-167, both containing three APR QTL, were selected as germplasm for resistance breeding. High-throughput markers for selection were developed and implemented in pyramiding the APR loci.