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Regional Breeding for Wheat Stripe Rust Resistance in the Eastern United States

Regional Breeding for Wheat Stripe Rust Resistance in the Eastern United States. David Marshall Plant Science Research Unit Raleigh, NC. The U.S. has the most cost-effective and plentiful food production and supply system in the world. Wheat Stripe Rust.

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Regional Breeding for Wheat Stripe Rust Resistance in the Eastern United States

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  1. Regional Breeding for Wheat Stripe Rust Resistance in the Eastern United States David Marshall Plant Science Research Unit Raleigh, NC

  2. The U.S. has the most cost-effective and plentiful food production and supply system in the world.

  3. Wheat Stripe Rust

  4. Stripe Rust Epidemic Years and the States with Greater than 1% Yield Loss from 1976 to 2004. % Loss Epidemic Year

  5. Objectives: • Identify stripe rust resistance/susceptibility in Eastern U.S. wheat cultivars, elite lines, and other germplasm. • Identify the gene or genes involved resistance. • Introgress stripe rust resistance into elite lines having regional/local adaptation. • Distribute populations and fixed lines to cooperators.

  6. Protocol: • Established the Uniform Eastern Wheat Stripe Rust Nursery. In 2005-06, had up to 20 entries from State breeding programs in FL, GA, NC, VA, MD, NY, MI, MO, IL, IN, KY, AR, and LA; private breeding programs – Westbred, AgriPro-Coker, and Genesis; and USDA/ARS. • Seedling screening in Raleigh, NC. • Field screening in Plains and Griffin, GA; Kinston, NC; Baton Rouge and Winnsboro, LA; Fayetteville, AR; San Antonio, TX, Pullman and Mt. Vernon, WA.

  7. Identified 102 lines with resistance better than the "resistant" check (Pioneer 26R61). Infection types less than '3' and severities less than 18%. Identified adult-plant resistance in at least 8 lines:

  8. Several lines had combined stripe rust, leaf rust and powdery mildew resistance.

  9. Regional Breeding scheme for introducing resistant sources: A. Backcross-Bulk (minor genes) 1. Several resistant sources x Adapted type 2. Backcross to Adapted type 3. Select in BC1 through F3 for low terminal severities B. Accelerated Population Development for major genes 1. Resistant source x Adapted type (crosses made in February) 2. F1 planted in NZ in May, F2 in NC in Nov, F3 in NZ in June, F4 in in Nov.

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