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Oat Lines with Effective Adult Plant Resistance to Crown Rust
1U.S. Department of Agriculture, Agricultural Research Service, Cereal Disease Laboratory, University of Minnesota, St. Paul 55108.
Plant Disease
|March 3, 2019
Summary
Durable adult plant resistance in oat lines offers better protection against crown rust (Puccinia coronata) than race-specific resistance. One line, MN841801, showed exceptional slow-rusting traits over seven years, indicating effective, long-lasting disease control.
Area of Science:
- Plant Pathology
- Agronomy
- Genetics
Background:
- Race-specific resistance in oat cultivars against crown rust (Puccinia coronata) is often overcome by evolving pathogen races.
- There is a need for durable resistance mechanisms that provide long-term protection against diverse pathogen populations.
Purpose of the Study:
- To assess partial resistance in experimental oat lines against crown rust.
- To identify oat lines with durable adult plant slow-rusting resistance.
Main Methods:
- Experimental oat lines were evaluated for crown rust severity in field plots under natural infection.
- Controlled greenhouse inoculations assessed infection efficiency.
- Seedling tests identified race-specific resistance against local pathogen isolates.
Main Results:
- All 14 experimental lines showed significantly reduced disease progress compared to a susceptible check.
- Nine lines performed better than a standard slow-rusting cultivar.
- One line, MN841801, exhibited exceptional field resistance over seven years and reduced uredinia in greenhouse tests.
Conclusions:
- Experimental oat line MN841801 possesses effective and durable adult plant resistance to crown rust.
- This line can serve as a valuable genetic resource for breeding programs seeking long-lasting disease control.
Keywords:
partial resistance
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