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Crown rust resistance of oat germplasm from the ARS-Aberdeen program

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Crown rust resistance of oat germplasm from the ARS-Aberdeen program

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  1. Crown rust resistance of oat germplasm from the ARS-Aberdeen program J. M. Bonman (1), D.E. Obert (1), E. W. Jackson (1), S.A. Harrison (2) and M. L. Carson (3). (1)USDA-ARS, Small Grains and Potato Germplasm Research Unit, 1691 S. 2700 W., Aberdeen ID 83210; (2) Louisiana State University, AgCenter Agronomy Department, 104 MB Sturgis Hall, Baton Rouge, LA 70803; (3) USDA-ARS Cereal Disease Laboratory1551 Lindig Ave., St. Paul, MN 55108.

  2. Where is Aberdeen? University of Idaho Research and Extension Center, Aberdeen, ID

  3. Background • Previously the program targeted the Intermountain West– objective was high yield and quality • Currently a need to make Aberdeen material more widely useful by incorporating disease resistance

  4. Objectives • Characterize crown rust resistance within Aberdeen cultivars and breeding lines: • Field reactions in “hot spot” locations (Castroville, TX; Baton Rouge, LA) • Seedling resistance to many isolates (CDL) • Field reactions to single isolates (isolated plots in Aberdeen, ID) • Assess partial resistance of selected materials in greenhouse inoculations with compatible isolates

  5. Test lines and cultivars

  6. Check cultivars • CDC Boyer • IA98822-2

  7. ID field plots for single isolate tests

  8. Single isolate testsExperimental units = single hills

  9. Field tests—naturally occurring inoculum

  10. Field tests—single isolate evaluations

  11. Greenhouse tests versus a spectrum of isolates

  12. Leaf segment inoculation technique: Provena 99Ab11862 95Ab11439 99Ab11813 99Ab12179

  13. Greenhouse test for partial resistance

  14. Conclusions • Most of the Aberdeen cultivars and lines are highly susceptible to crown rust • A few lines showed less disease in field trials • specific resistance to some isolates • partial resistance to compatible isolates in the greenhouse, thus field response probably due to partial resistance