1a.Objectives (from AD-416):
Introduce spring and winter wheat germplasm with potential stripe rust resistance
from CIMMYT/Mexico and CIMMYT/Turkey and clear through quarantine
regulations. Evaluate introduced germplasm for stripe rust resistance, distribute introduced stripe rust materials to interested wheat breeders, and make crosses to transfer stripe rust resistance from introduced materials into adapted winter wheat cultivars.
1b.Approach (from AD-416):
Several new international nurseries from CIMMYT/Mexico and from the GOT/CIMMYT/ICARDA Program in Turkey will be introduced and grown under quarantine regulations in the greenhouse. Previously introduced germplasm will be screened in the regional disease nursery in south Texas, and the winter types also will be evaluated in Oklahoma. All populations derived from crosses for stripe rust resistance will be screened in south Texas and in Oklahoma. Introduced materials and F3 populations with good stripe rust resistance will be made available to interested breeders from the region. CIMMYT materials will be distributed under their MTA.
During the 2013 season, several new international nurseries from CIMMYT/Mexico were cleared through quarantine procedures. Most of the advanced spring wheat lines included in these nurseries have stripe rust resistance based on adult plant resistance, plus many have resistance to the new race of stem rust (Ug99). In addition, new nurseries from Turkey were planted in quarantine grow-outs during the 2012-2013 crop cycle. Materials were distributed to wheat breeding programs across the nation to aid in the development of new wheat cultivars with resistance to stripe and leaf rust pathogens. Genetic-based resistance is the preferred approach to controlling fungal pests as it is more environmentally friendly than fungicide applications.