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ARS Home » Northeast Area » Beltsville, Maryland (BARC) » Beltsville Agricultural Research Center » Molecular Plant Pathology Laboratory » Research » Research Project #430593

Research Project: Development of Novel Control Strategies for Diseases Caused by Cellular and Sub-cellular Pathogens

Location: Molecular Plant Pathology Laboratory

Project Number: 8042-22000-295-000-D
Project Type: In-House Appropriated

Start Date: Mar 16, 2017
End Date: Mar 15, 2022

Objective 1: Develop novel plant virus-based expression vectors through the characterization of plant virus and viroid genomes. [NP 303, C2, PS2A] • Sub-objective 1.A. Characterize the genome expression strategies of plant viruses for vector development. • Sub-objective 1.B. Develop novel plant virus-based expression vectors utilizing modules derived from plant viruses, viroids, and plant genes. Objective 2: Identify changes in host gene expression and small RNA-mediated regulation associated with viroid and virus infection and spread as targets for disease management. [NP 303, C2, PS2A, PS2B] • Sub-objective 2.A. Perform a functional analysis of genes and proteins involved in protein phosphorylation pathways in virus and viroid infection to identify targets for disease control. • Sub-objective 2.B Identify the roles of viroid-specific small RNAs in plant disease. Objective 3: Develop strategies using plant viruses for the production of antimicrobials for the prevention, treatment, and control of plant and animal diseases. [NP 303, C2, PS2A] • Sub-objective 3.A. Evaluate novel functional proteins for control of plant diseases. • Sub-objective 3.B. Develop functionally active proteins in plants for treatment and control of animal diseases.

This project has two goals: reducing crop losses due to plant pathogens and developing novel compounds to promote growth, improve feed efficiency, and control diseases in farm animals without the use of antibiotics. Fundamental new knowledge of plant pathogen genomes and complex host-pathogen molecular interactions are required to develop novel strategies for disease control. In animals, there are increased challenges to controlling pathogens impacting food safety and infecting livestock and poultry, yet there is a conflicting need to reduce overused antibiotics. Therefore, there is a demand for antibiotic alternatives and novel vaccines, antimicrobials, diagnostic reagents, and therapeutic compounds with reduced cost and low risk to humans, animals and the environment. The unifying concept of this project is the development and use of plant viral-based vectors as tools for the expression of nucleic acids and proteins in plants as a means of studying plant/pathogen interactions, and to develop methodologies useful to control plant pathogens and animal pathogens. In Objective 1, we will study plant virus and viroid genomes (and genome expression strategies) and develop and modify novel plant virus-based vectors based on marafi- tobamo- and potexviruses, viroid genomes, and plant genes. The plant virus-based vectors will be utilized to gain fundamental knowledge of plant virus and viroid host interactions and as tools for expression of heterologous nucleic acids and proteins in plants for plant and animal disease control. In Objective 2, we will perform experiments to evaluate changes in plant host gene expression, and the role of small RNA-mediated regulation, in virus and viroid infection and to determine if phosphorylation signaling pathways play a role in virus and viroid pathogenesis by using protein interaction and gene editing tools. In Objective 3, we will design and express novel antimicrobial proteins in plants to protect against phytopathogenic bacteria and we will design and produce novel recombinant proteins and modified plant virus-like particles which retain functional activity and immunogenicity for control of animal pathogens.