Location: Wheat, Sorghum and Forage Research
Project Number: 3042-21000-033-000-D
Project Type: In-House Appropriated
Start Date: May 3, 2018
End Date: May 2, 2023
Objective 1: Identify candidate viral and host genes, through use of mutational analysis, protein-protein interaction, and genomic studies for enhanced control and management of Wheat streak mosaic and Triticum mosaic viruses. Objective 2: Develop and characterize transgenic wheat for resistance to WSMV and TriMV, and pyramid transgenes with natural resistance genes. Objective 3: Identify, characterize, and deploy biologically active peptides and genes from the primary and secondary gene pool of wheat for resistance to viral, fungal, and bacterial diseases of wheat. Objective 4: Develop and characterize adapted winter wheat germplasm with broad and specific disease resistance, and with improved grain nutritional quality. Objective 5: Develop scab resistant winter barley and winter wheat germplasm.
The primary objectives of this project are to develop improved wheat germplasm by enhancing disease resistance and grain quality traits. The project will characterize genes of Wheat streak mosaic virus (WSMV) and Triticum mosaic virus (TriMV) responsible for pathogenicity and vector transmission. This information will be used to develop transgenic wheat with resistance to both viruses, and to the common vector, the wheat curl mite. The project also will use TriMV to express biologically active peptides in wheat, to effect control of bacterial and fungal diseases. Natural (non-transgenic) sources of virus resistance will be used to develop and select germplasm with such resistance, and distribute it to breeding programs world-wide. The project will complete the evaluation and distribution of wheat breeding materials with resistance to Ug99 forms of stem rust, and with low levels of grain phytic acid. The latter will lead to wheat with improved mineral nutrition and diminished anti-nutrient properties. Developed germplasm will be characterized and distributed via the USDA-ARS Lincoln coordinated Winter Wheat Performance Nursery Program. The project consists of three integrated components: germplasm development and evaluation, viral genetics, and plant pathology. Molecular and conventional methodologies will be utilized, and the project scale will range from DNA molecules to field-level. The project also has extensive formal and informal collaborations enhancing our ability to conduct this research. Anticipated products include improved wheat germplasm for the wheat seed industry with value-added traits and biotic stress tolerance, and new targets to continue the laudable goal of developing host-plant resistance.