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

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.


Where is aberdeen

Where is Aberdeen?

University of Idaho Research and Extension Center, Aberdeen, ID


Background

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


Objectives

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


Test lines and cultivars

Test lines and cultivars


Check cultivars

Check cultivars

  • CDC Boyer

  • IA98822-2


Id field plots for single isolate tests

ID field plots for single isolate tests


Crown rust resistance of oat germplasm from the ars aberdeen program

Single isolate testsExperimental units = single hills


Field tests naturally occurring inoculum

Field tests—naturally occurring inoculum


Field tests single isolate evaluations

Field tests—single isolate evaluations


Greenhouse tests versus a spectrum of isolates

Greenhouse tests versus a spectrum of isolates


Crown rust resistance of oat germplasm from the ars aberdeen program

Leaf segment inoculation technique:

Provena

99Ab11862

95Ab11439

99Ab11813

99Ab12179


Greenhouse test for partial resistance

Greenhouse test for partial resistance


Conclusions

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


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