Epidemic Year % Loss Stripe Rust Epidemic Years and the States with Greater than 1% Yield Loss from 1976 to 2004.
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.
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.
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: LA95171CA58-3- 2-CCK9134/PIO2684,F1//90239A29-1-X(CL850643/PIO2548//C9877) 97C-0554-01VA94-54-549/Roane//Kristy B010973L880085/XW502 Coker 9511 L881060/L880436 IL87-2834-1Tyler / Howell IL02-5030P88288C1-1-6-1-2-8 / 96-6472 IL03-1843897-3574 / 95-4162 INW0412Huapei 57-2/Patterson
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.